Let me explain:
South Park, Simpsons, Family Guy, etc. are adult animated shows, but they only focus on Comady, I have yet to see one with say a more serious story and premise. Anime has that, but I rarely seen one from Western origins.
The exact kind of adult animated film with a serious story is this: http://www.youtube.com/watch?v=6-UCLiQ5EdQ
Sadly we rarely get movies or series because thanks to Disney, they left a legacy (or stigma) in the minds of people that animated films are only for children :(
Personally I wish for an 2D animated War Drama similar to Apocalypse Now, Band of Brothers, etc.
Do you guys agree there should be more animated films for adults?
For some reason, most people still have this "animated = children stuff" idea. I think it's a big issue in making serious animated movies because that means most of your target will not even bother trying and skip it making you lose a lot of money. Also, it costs quite a lot of money because of the time it takes to generate the images with a raytracing engine...
Also, people will tend to compare them to real life actors since the fact it's more serious probably means you can't go for a deformed or funky design for characters and such. At least until now, i think we lacked power to emulate live actors convincingly...nowadays however we could definitely handle it with current tech.
Some movies take risks like Immortal (http://www.imdb.com/title/tt0314063/?ref_=fn_al_tt_1
), Renaissance ( http://www.imdb.com/title/tt0386741
/ ) and everybody remembers the Final Fantasy movies (especially the 2001 one, http://www.imdb.com/title/tt0173840/?ref_=fn_al_tt_1
). It would be even harder to make an adult audience come see a non 3D animated movie i think, even though japanese animes are pretty successful.
But yeah, i also wish they'd make more.