It's been mentioned here but fuck 'the game' ending was bad.
I watched that film after a friend recommended it, 'nuff said there.
Yeah the film was a massive effort to drop a big "Wow wasn't expecting that!!" twist ending. Logic and all was just thrown away. So afterwards if you ran your mind back over the movie and thought about what was really going on, it was just stupid.
And the last scene where he's pulled off the safety matt and told that everything was fine and he's totally happy and cool with what he'd been through. I was the one who wanted to grab an ax and go all American Psycho on them.
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Oh and edit:
Not like it ruined the movie, just a silly over-rated scene. But the ending of 'A few good Men' the much quoted "You can't handle the truth!!" scene where Tom Cruise basically goads Jack Nickelson's character into a tirade about how hard core and tough he is . . . and then he openly admits that he ordered men to kill the guy. And then is all nose in the air, "Now if you're done with this silly trial I'm going back to my base" not expecting to be in any sort of trouble. Just stupid, can't see why it's so well regarded - just my opinion