Here's a few I get crap for not liking a lot...
Forrest Gump [the best way I know to describe it is this: I consider Forrest Gump the Everybody Loves Raymond of film]
Requiem for a Dream [I'm always shocked to see this ranked higher than The Fountain]
Star Wars [pretty much all of them save The Empire Strikes Back]
Mystic River [Sean Penn may have killed this thing, but Linney certainly buried it.]
The Sixth Sense
The Godfather [Part II blows it out of the water, I think]
And although I don't think it's terribly overrated, hearing people call Saving Private Ryan a better film than The Thin Red Line is outrageous to me...