let's see for me...
Assassins Creed: A lot of magazines, websites, and people were claiming this game to be so amazing and innovative blah blah blah. well, when I bought the PC release of the game, I was insanely disappointed; the gameplay was really repetitive, HEY GO KILL THIS BAD GUY AND THEN COME SEE ME, KILL THE GUARDS ATTACKING CITIZENS, FIND ALL THE POINTS, BLAH BLAH BORING. I can't believe I actually played through this piece of shit. I guess I can give the story some credit, it was pretty neat, but still the gameplay ajdfsdaflksdjfsajf. also, the graphics really blew me away! (not like crysis, but still this game has amazing graphics.)
TESIV: Oblivion: I really was not impressed by this game, I don't know how it won game of the year 2007 from so many places. Maybe I'm not intelligent enough to play it's type of game, or something. Elder Scrolls III: Morrowind was awesome, don't get me wrong, I spent probably over 300 hours trying to get everything on it (don't have xbox anymore

(), but I just kind of couldn't stand this one.
On another note, I really enjoyed Bioshock, sure it didn't live up to its hype, but it was a really great game. The idea was good, but they didn't implement it as well as they could have I guess.