I pretty much only like Romero zombie movies, he actually manages to tell a story in his zombie flicks. Though Children Shouldn't Play with Dead Things is great (plot: film students decide to make a zombie movie, since they can't afford extras and make-up they decide to actually resurrect the dead, the obvious ensues... movie actually made by film students using their names for the character names, highly intentionally funny). I don't think I ever saw Cool World, Bakshi's never really been good on plot though so it wouldn't suprise me that it sucks. I'm pretty forgiving of most movies, but League really butchered a really good Alan Moore story so it extra irritated.
See, I'm much more superficial (I say this without shame ;) The movies I enjoy, I couldn't tell you who wrote or directed or produced half of them. I was so hyped up to see SPIDER-MAN, and a friend who's also a comic geek said she wouldn't see it because she "hated Sam Raimi!" And I was all, "Who's Sam Raimi?"
And I never even read the LXG comics, so I had nothing to compare it to. :o)