what are your favorite games to play on ...

What are YOUR favorite games to play on Xbox live? i was just wondering cause im going to buy a couple games this week and im getting an xbox live gold account so i just wanted to know some good xbox live games.what are your favorite games to play on ...
CoD4, RSV2 and Halo 3what are your favorite games to play on ...
Halo 3. I can only play with friends or my brother though. If Im by myself then I get bored very easily with the game.Rainbow Six Vegas 2
Shadowrun
Halo 3 and CoD4.
Mine has got to be Call of Duty 4 because of the intense action and guns. Might try out Battlefield: Bad Company though it looks great.
Call of Duty 4. Very good MP.
gears of war
Halo 3, Call of Duty 4, GTA IV, and Forza 2.
Grand Theft Auto 4, Lost Planet: Colonies Edition (only online), Gears of War, Call Of Duty 4, and in August ...Mercinaries 2.
COD4,Halo 3,and BF:BC demo soon to be game.
Call of Duty 4, Halo 3 and Rainbow Six Vegas 2
Call of Duty 4 and gears of war are good choices for online games.
GEARS!! Call of Duty 2 back in the day, good times.
R6V2 and CoD4 are mainly what I play on live. GTA is also alot of fun on live.