See here for terms (and other nominees).
Worst well-regarded film: Psycho
Everybody talks about the shower scene; no one ever talks about the Encyclopedia Britannica Educational Filmstrips Inc. bit at the end where the psychiatrist spends about ten minutes explaining What We've Just Witnessed. Bears a superficial resemblance to real case histories of serial killers, but is in thrall to psychiatric notions since consigned to history's scrap heap. Ruined Janet Leigh's acting career, and inaugurated Hitchcock's rapid descent into torture pornography. What's up with the detour in the middle with Martin Balsam's character?
Most overhyped film: Citizen Kane
The pioneering work of the "tidy psychological explanations" school of filmmaking. A piece of nose-thumbing playground satire that opened technical doors someone else would have gotten around to soon enough.
Worst film to win a Best Picture Oscar: Kramer vs. Kramer
Contains, and exemplifies, the dirty little secret of the Baby Boomers: they despise and resent their own children because they believe history should have ground to a halt with them still at the centre of the universe.
Most disappointing film: Barton Fink
What's next in this mathematical series: Blood Simple, Raising Arizona, Miller's Crossing...? You say it's a Dada horror/comedy about Clifford Odets? C'mon, you have to be shittin' me. (Would be less disappointing now, simply because we've since learned that the Coen Brothers have to work this stuff out of their conjoined systems every so often and if we're patient they'll eventually deliver with a Fargo.)
Worst movie: Twin Peaks: Fire Walk With Me
Worst movie with good direction: Aronofsky's π (haven't seen The Fountain but it sounds like it would take this cake pretty easily)
Biggest unknown treasure: Quick Change (1990)