B.C. Rock

IMHO, The Black Cauldron I admit I might be the minority.
Tony Iommi and Geezer Butler of Black Sabbath watch My Little Pony: Friendship Is Magic

I'll probably catch some flak about this, but how about Bakshi's "Lord of the Rings" or "Wizards"?
They're good in an historic sense for the trippy animation (rotoscope?), but they don't hold up too well IMO. I never thought the acting was all that great, either, but I'd imagine both are big cult favorites.
I was pretty young (and pretty high) when I saw Rings in the movies way back when, and thought it was cool back then. But I saw a bit of Wizards a few yrs ago on TV when I was old and sober. Let's just say one of us hasn't aged very well . . .
Also from the 70s is a film out of France called "Fantastic Planet". I like this movie alot, and I don't think it's bad at all, but I can see some folks thinking that it moves too slow or not liking the peculiar soundtrack.
Mr. Magoo's Christmas Carol?
A Must See. Probably on you tube.
You Fill Me with Inertia.

Wicked City (1987) ! I will get hate for that cause some people consider it a classic. I just think its a mess of a anime. But everybody has different taste.

Either of the animated Titanic movies. Maybe 'Where the Dead Go to Die' but that's intentionally crappy.
Stay back, geek! It's about to get tragic.