I didn't like him because he kind of ruined the realism of the series. Every other character except for Diamondback feels like they could actually exist(super powers aside, obviously). But he felt way OTT.
Second, I didn't think his motive for killing Luke made sense. Basically he wanted to kill Luke because their father didn't care about him.
Not quite. It was that his father actively rejected him, and then when he went to prison, his father cut ties with his mother and she died of cancer completely alone. He went after Luke because Diamondback felt like he deserved to be the "favored son" rather than Luke.
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Yep, you are right, the only compelling baddie is Fisk.
We'll see how Iron Fist turns out but if it is another lame villain they will have to switch things up to keep our interest.
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These Netflix Marvel series seem to start off really great, but then fizzle out by the end. Mainly due to introducing weak villains, like Diamondback. Or Kilgrave.

Diamondback was a HUGE fail to me, didn't like him, thought his motivation was pathetic. No issue with the actor, he did an ok job with what was given to him but the character was weak. They made a mistake killing off Cottonmouth so early, they needed to stretch out his storyline and then have him killed towards the end with the framing of Luke Cage part perhaps made into a cliffhanger.
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you're trying to apply logic to crazy. it doesn't work

Yeah it was so rushed, just didnt sit well.

The problem is they introduced him late in the show and didnt give enough time for people to really care about him. And theres no reason why he needs to be his brother, its just kind of shoved down your throat, its like by the way theyre brothers, so you have to care about their relationship.
They didn't even take advantage of the opportunity to surprise the audience with them being half brothers. It was announced almost at the same time as his appearance in the show.

The problem is they introduced him late in the show and didnt give enough time for people to really care about him. And theres no reason why he needs to be his brother, its just kind of shoved down your throat, its like by the way theyre brothers, so you have to care about their relationship.

We didn't get to see his performance as a gang leader, prior to finding out that Carl Lucas is still alive.

"You looked at me funny, so you get to die. And you were sitting next to him when he looked at me funny, so you get to die too."
I wish there was scene like that. That's hilarious.

Nutjobs don't always make sense.
I get your point, though.
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You prefer Diamondback hate Luke over a woman?
I agree. He's got a better reason in this. Hating someone over a woman is a b!tch move.
Marriage is a wonderful institution, but who wants to live in an institution?
~Groucho Marx

diamondback hated luke in the comics because of reva and he was a friend not a brother. those idiots changed it for worse
You prefer Diamondback hate Luke over a woman?
And whats up with this?
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I feel like we'll be getting in to his real character development if they make a series two. For now I'll just say that I found him enjoyable. I really liked watching him, especially that moment where he shot that guy.
Cottonmouth was better though, which is a shame.

I thought he was a very weak villain. Nothing more than a pathetic Luke Cage wannabe with daddy issues.

That sums it up for me. Right down to the suit he wore in the finale, he was pure comic book cheesiness but in the best way possible.

He was a little over the top, but purely entertaining.

Yeah I feel like we needed more back story - with the dad, and maybe romantic relationships with women they loved etc - to really help his psyche. He just seemed like a spoiled brat at the end but it didn't mesh because he looks like a 50 year old Black man with some form of autism.

Luke didn't have to do anything to provoke Diamondback's wrath. Stryker saw Cage as the favored son and that was enough. Diamondback definitely blames Luke for his (Stryker's) mother dying alone. Stryker is the first born son but was not legitimized like Luke was.
Those are weak reasons. He didn't want to kill Luke when they were kids, and nobody with the slightest trace of sanity would blame Luke for Diamondback's mother dying alone.
I know he says a "tension" existed between them as kids, but it was subtle enough that Luke didn't even notice it. They were best friends.

Second, I didn't think his motive for killing Luke made sense. Basically he wanted to kill Luke because their father didn't care about him. That's dumb. Luke didn't even know they were related, and he wasn't the reason that Diamondback went to juvie or jail. I understand some tension and jealousy. But framing him, then trying to kill him? That's just way over the top.
Luke didn't have to do anything to provoke Diamondback's wrath. Stryker saw Cage as the favored son and that was enough. Diamondback definitely blames Luke for his (Stryker's) mother dying alone. Stryker is the first born son but was not legitimized like Luke was.
With all the biblical references in the series, it's clear that their relationship is meant to mirror that of Cain and Abel.

they should've sticked with his comics origin.
Diamondback hates Luke because he blames him for his relationship breakup with Reva. Its more engaging the way it was written in the show.

Agree completely, they should've sticked with his comics origin. Same with Shades.