Games I haven't played:
Grand Theft Auto IV
Portal 2
Super Mario Galaxy 2
Uncharted 2
The Orange Box
Batman: Arkham City - Pretty fun Batman game, I liked it more then Arkham Asylum. Mostly because of all the new gadgets
Bioshock - Nice shooter with a very interesting story. Rapture was a great place to explore
Grand Theft Auto 5 - My favorite GTA. Didn't like Trevor though.
The Last of Us - Nice story, and was very intense with the clicker parts
The Legend of Zelda: Twilight Princess - Nice Zelda game, but isn't my favorite 3D Zelda game
LittleBigPlanet - I like playing with the create a level mode. Didn't like playing the actual game because of the terrible jumping
Mass Effect 2 - I'm currently playing this, and I'm already enjoying it more then ME3
Red Dead Redemption - Nice open world game, and i liked the story. They really pulled off the western vide of the game.
Skyrim - Put lots of hours in the game just exploring. Haven't beaten it yet. Got it on PC last year, and have been modding it like crazy which adds more to the fun
Super Mario Galaxy - My 2nd favorite Mario game, right behind Sunshine. I really liked using Fllod in Sunshine
I played the other 11. My least favorite out of the 11 that I've played, is probably Bioshock. That's not saying it's a bad game, I actually liked it. I just didn't ike it more then the other 10. My favorite on the list, is Super Mario Galaxy. I had so much fun with that game, I beat it twice and collected everything both times. I really should replay it again sometime, or at least play Super Mario Galaxy 2 at some point.