Since Im too casual in the anime fandom Im not completely sure what would be considered unpopular or not, but here goes anyway.
Also I like to write so this will be long.
With some rare exceptions Im a dub only girl.
I adore Lelouch of Code Geass, but hes overall a villain protagonist to me. I also consider him to have made Susaku the shell of himself that he became.
Guilty Crown has a interesting premise, but overall poor execution.
Madoka Magica is a welcome deconstruction of the magical girl genre, but the designs of the characters, witches, and labyrinths are atrocious and kind of destroy the seriousness of the world for me.
I have never watched Naruto and the overall art style of the show makes me not want to.
Howls Moving Castle is the only movie by Miyazaki that I liked. The others I've seen are boring,and I don't like his art style.
Anime hair colors bother me, and take the seriousness of a show down several notches.
I've never watched Neon Genesis Evangelion and have no real desire to.
I've tried to watch Clannad and Last Exile several times over the years, and just can't. The boredom factor of both shows is high.
Fan-service (female or male)
never
has a place.
Huge eyes- I can do with less of it. Much less.
Fullmetal Alchemist is the only true version of the show. I tried to watch Brotherhood and it was way to comedic. Both shows have very ugly art styles though.
Bleach is an action anime first and foremost. This is not a good thing.
Death-Note is at the same time an interesting chess match between a villain protagonist and a antihero while also being kind of boring.
The
only
good romances are subtle ones.
I
know
its Japanese made, but I cant help but be slightly annoyed when clearly westernized characters are sleeping on futons, eating with chopsticks, sitting at a small table on the floor, wearing kimonos, bowing, eating box lunches,
excessively
wearing school uniforms etc.
A sure fire way to make me ignore a female character is for her to be sexualized eyecandy and/or solely a love interest.
Sword Art Online- Is boring with poor execution. Stopped after episode 8 and have no desire to pick it back up.
Shipping annoys the hell out of me, and I will never get in a conversation both online or off that involves it.
Soul Eater- The art style is an eyesore, and I despise the characters of Death the Kid and Black Star.
I dont like Pokemon and never really have. Im honestly wondering why its still around. However, even having said that, Ash, Misty and Brocks adventures are the only canon to me. All others fall under discontinuity.
I dont read or care about manga.
Fairy-tail has a lot of magic (I love fantasy animes), but the
extreme
amount of comedy killed it forever for me, and that's why I cant finish it.
D-Grayman- Considering the subject matter (apocalyptic) it should be darker than it is.
Cardcaptor Sukura is a delightful magical anime, but romance wise I think Sukaras feelings for Li came out of nowhere.
Raki from Claymore is adorable and I dont have a problem with him.

Porco Rosso is better than Spirited Away
I'll agree that it's at least as good.

I ship Laluche with all 3 girls
I don't ship any guy from Free!, none of them have a romantic feelings for each other.
Rukia is one of the best looking girls in Bleach
DRRR is WAY better than Baccano
Death Note is boring
Lucy from FT is overrated
Porco Rosso is better than Spirited Away

Space Dandy is actually more fun and enjoyable than a lot of shows that have a plot.
This is unpopular? I thought most enjoyed the show?
I'd like to add to mine

• Zetman & Code:Breaker, despite both having 35 episodes worth of material crammed into 13, are both very good shows.

Thought of some more:
One Piece really went downhill after the timeskipwhich is the Most Pointless Timeskip Ever
Fanservice is actually okay if done in moderation
Space Dandy is actually more fun and enjoyable than a lot of shows that have a plot.
Being a fan means being unashamed of what you like, no matter what anyone else says

"Attack on Titan" is not the greatest series ever. In the manga, all the side characters look the same. Also, the characters are basically stock military movie characters. You have the prejudiced vengeance seeker, the timid soldier that always panics in battle, the cold female, the star pupil bully, and the hardass instructor. Finally, the fanbase pisses me off to no end. If you dare to say anything bad about it, they will have you crucified. They never shut up about this series. They also tend to blurt out spoilers like as if they think you've already seen it. Yeah, I really needed to know that
Eren became a Titan
before I actually got to that part. It really helps my viewing experience that I don't get surprised. AOT fans are quite possibly the most annoying fanbase I experienced, and I really hope AOT dies quickly so those people can move on to the next passing fad like they did with "Mirai Nikki" and "Sword Art Online."

I hated Gantz. The pacing was godawful. The CGI was just laughable. The Dub and Sub were almost Bible Black status at times.
I agree, After Story's ending
was a major copout
.
Claymore had one of the worst protagonists I've ever seen, Raki. Claire wasn't that great either.
Samurai X: Trust and Betrayal is far better than the series.
I don't like fanservice in anything besides the ecchi and harem genre.
Sword Art Online was trash.
Elfen Lied is far from "mature" or sad. It's themes didn't hide the cutesy characters, fan service, harem, or
incest love interest
.
That being said, I actually enjoy some harem and ecchi anime.
Mirai Nikki was bad.
Watamote is not funny.

My opinions.

• Every Tenchi Muyo! series in existence is terrible.
• FLCL is horrible, i felt myself becoming dumber as subjected myself to each episode.
• Toriko is currently the best shonen anime.
• Naurto, One Piece, & Bleach all suck.
• Fairy Tail, while good, is horribly overrated.
• Dub is better than Sub.
• Durarara!! is better than Baccano!
• Gurren Lagann is not the greatest thing to ever happen, according to most, it is.
• Inuyasha should not have gotten The Final Act.
• Big O Season 2 is just as good as season 1.
• Deadman Wonderland is pretty popular right? it's a POS.
• Gun X Sword is a worthy rip off of Trigun & Bebop.
• I find Chobits extremely boring.
• I haven't & probably never will watch NGE.
• The last 13 episodes ruins Death Note.
• Eden of the East is completely average. Most tell me it's amazing.
• HSOTD sucked.
• Wulin Warriors is THE GREATEST SHOW EVERthat one was a sick joke.
  That's all i can think of at the moment.

Isao Takahata's films are better than Hayao Miyazaki's.
Hayao Miyazaki films from Princess Mononoke onward are boring, unsubtle, badly written messes usually with tacked on endings - It doesn't help that most people treat Miyazaki like some god of anime that must not be spoken ill of, it's a shame that he has become synonymous with Ghibli which robs credit from the other people at the studio (I don't mind his films up to Porco Rosso).
Innocence is better than Ghost in the Shell (I know this has already been mentioned in another post).
A show that has been edited and/or dubbed can be better than the original version - See Samurai Pizza Cats vs Kyatto Ninden Teyandee or Cowboy Bebop.
No matter how far a Jackass travels, it won't come back a horse Batou - GITS 2: Innocence

I thought most people prefer dubbed?
It always seemed to me i was in the minority that I prefer subtitles. The only exception is Robotech. I like the dub and rewritten plot combining 3 separate animes into a sci-fi epic.

Didn't like Cowboy Bebop & found it to be overrated. Samurai Champloo was better.
I'm the Corruptor.

I prefer dubbed when it's available.
I hate characters who share characteristics with animals.
I hate it when female characters try to be cute.

I didn't find Clannad:AS sad
Don't watch the last episode.I prefer it to end sadly rather than
alternate endings
I will walk over your cold corpses

I think most ppl prefered the newer dub of Akira

Another one:
Princess Mononoke is the bets animated film ever
Tatum is the best voice for Sebastian, so superior to Ono
I liked the 2nd season of Darker than Black
Orihime from Bleach is average looking
My favorite role of Vic's is Tamaki from OHSHC
Bleach is the best anime
The End of Evangelion is a terrible movie
I like Shinji more than Asuka
Fate Stay Night sounds a lot better in English
Anohana is not that great

Okay, here I go

• The anime of
  Naruto Shippuden
  sucks and doesn't do any justice to the manga at all
• I prefer the 2001 English dub of
  Akira
  over the 1990 dub
• I think
  Soul Eater
  is stupid and overrated

Fairy Tail
has the best English dub of any anime
And lastly

• I think
  The Lion King
  is WAY better than
  Kimba the White Lion
  A Decepticon never retreats
• Starscream (G1)
  [Formerly CosmosX9]

I actually hate the animation in Ultimate for that very reason. Those long arms and shark grins are silly.
Another unpopular opinion I hold is that TV series Alucard looked scarier than OVA Alucard.
http://werewolvesbeatingadeadhorse.blogspot.com/

Hellsing Ultimate
: Not much to it other than flashy, over-rought fight scenes and characters who spend all day wearing huge, maniacal grins. It gets really old, really fast.

Here's mine:
I can't STAND Crispin Freeman as Alucard in Hellsing. He has a smooth nice American voice but that is not what the character is at all. I can only listen to the awesome Japanese voice.
That being said - I only like Anderson's Scottish dub. I wish I could have Japanese Alucard and Scottish Anderson voices in a battle.
http://werewolvesbeatingadeadhorse.blogspot.com/

God bless you sir. Ive been trying to bring this message along to everyone for years but the English released Fist of the North Star movie marketed the film as nothing more than mindless over the top action. They need to watch the TV series.
My momma loved me but she died
Hud Bannon

Cowboy Bebop is not that good
Spirited Away is not that good
I like Shiji Ikari. The only time I hated him was in The End of Evangelion
I like both FMA original and Brotherhood equally.
I never ship guys
I hate Light from Death Note, and L is not that great.
Asahina from TMOHS is annoying as hell
I hate Bleach and Fairy Tail in Japanese. They sound beyond awful.

One Piece is one of the worst animes.
I have tried very hard to get into it, at least five times(1st on Fox Kids, dvds from Netflix in different areas, now Toonami). I just don't care for a single characters, too slow pace, guess I never really cared for pirates. I don't mind slow pace if I care for a character or main plot. I don't find the wackiness funny, it just feels forced.
Don't care for FLCL. I could feel my brain cells dying while watching.

Most "Naruto" fans I know find Sasuke irritating.
I know that Sasuke has many haters, but he also has many fans as well. As the Naruto TV tropes page says on its YMMV section: "there are fans who think he is just as justified in his actions as Naruto is."

Sasuke is one of the worts anime characters ever made.
How is that unpopular? Most "Naruto" fans I know find Sasuke irritating.
-While the 2003 FMA is good, it's not without it's flaws. Wrath was annoying as hell, giving Envy a gender was about as unnecessary as revealing that the Force is the work of micro-organisms, making Hohenhiem
Envy's father was a Masashi Kishimoto-level beep twist
, Dante had a good concept to her, but
was defeated too easily
, and Fuhrer Bradley
died out of pure stupidity
.
-"The Melancholy of Haruhi Suzumiya" was a terrible series with character that either had no personality (Yuki, Kyon) or were incredibly annoying (Haruhi).
-I think anime can be adapted into live action if put into the right hands. It's really like that with any adaptation.
-I think that there are Japanese voices more annoying than the dub voices. Orihime Inoue and Goku as an adult come to mind.
-On the subject of Orihime, I don't think she's the worst ever anime character. She's realistic because she doesn't want to fight, and her healing has saved many lives.
-Sakura Haruno is not the Aquaman of anime. She's actually useful.
Not necessarily anime, but Japanese entertainment related:
-I don't want Saban crucified for "Power Rangers." "Sentai" isn't this deep, adult series. It's a toy commercial that's been running for over 3 decades.
-On the subject of "Sentai," "Samurai Sentai Shinkenger" isn't perfect. I'm three episodes in, and the characters aside from the Green Ranger are either annoying or have no personality. Shinken Red is a self-righteous prick.