Glad someone mentioned Crash....even if it hadn't eclipsed BBM's rightful claim to the Best Picture Oscar this year, I would feel exactly the same way about it--it's so overhyped and contrived.
Here's another---The Big Lebowski. I liked a few scenes, especially the ashes in the wind scene, but overall, thought it was really not so funny or cool as everyone else seemed to think. I also was one of the few who didn't like The Piano.
On a more postive note, how about the most underrated movies of all time? At the top of my list would be one of my favorite movies, a little-seen gem called Local Hero that came out in 1982. It was Burt Lancaster's last film, though he's not the main star. In a way, the main star of the film is Ferness, the town in Scotland where the movie is set, and all the townspeople in it. It's subtley funny, sweet, beautiful, and magical. Check it out sometime.