Well, it all depends on who you're talking to about which film, and who else is present, then. I think Scarface is overrated on this forum; in a room full of hip-hop-hating businessmen who bash the film due to unforeseeable affiliations with a music scene or black culture, I might think it was unfairly bashed, and find myself defending the film.

One film which I think is underrated on this board is Titanic, but I'd never find myself on a soapbox to the world defending it...that is, the same world which made it one of the most popular films of all time.

The Brown Bunny, anyone? I think that would be my pick, for now.