Gump is a fine film. Great source material, altered enough to make it palatable (I wish they'd made the movie closer to the source, actually, instead of a little bit sentimental and mawkish -- the source material is bawdy). I think the hatred for Gump is way overdone and done with a little bit of pretense. It's a really good movie.
eta* I'd read Gump as a young adult. It's about autism, not intellectual incapability. Gump was a savant in the novel, but told the story distantly, through the eyes of autism, which made the narrative import more telling.