I'm gonna get yelled at....
The Dark Knight
I have my reasons. I'm a big fan of the Batman movies by Tim Burton, and I had quite a few comics and graphic novels, the new movies and graphic novels seem to stray a bit from what Batman is. Batman and Bruce Wayne are one person, just one, not two like Christian Bale does, and since when was The Joker a homicidal maniac? From memory, Batman dropped him in a vat of chemicals, and he went a bit more insane, he never randomly killed people like that. FUCK!
Heath Ledger wasn't that good of an actor, I liked Lords of Dogtown, he was excellent in that, but in Dark Knight, look past the fact that he's dead, and you'll be disappointed.
Anyway, it's just my opinion, there are worse movies, but to me, it was just a massive let-down, that's why I decided it's the worst.