Bioshock: Great game, but paying full retail price only to find I had 1/2 an hour of the game left to play from when I rented it filled me with rage & I havent bought a console game since.
GTA: I loved GTA II, I got GTA, & thought it was just ugly, clunky & dull by comparison
Boiling Point: Road to Hell: The only enjoyable part of this game is a conversation with a science student in a bar about an outlandish scientific theory
Europa Universalis III: Didnt work for ages, then when finally got access to a machine it worked on it sucked
Stronghold II: Proof that graphics can kill a game (some fun game modes though)
Neocron2: I thought a MMO FPS sounded kewl. By the time I finally was able to play it, it was an ugly, empty world I found