Live name = CAG name
CoD 3, PDZ, Gears, NBA 2K7, NHL 2K7, MLB 2K7, Crackdown, M:UA, DoA 4, PGR 3, Top Spin 2, Halo 2, Texas Hold Em (XBLA), several other XBLA games.
Edit: The MP in CoD 3 is much like Battlefield 2 for the PC. You have different classes you can be with different special abilities. You have 2 different assault types, tank killer, support, medic, scout (sniper), etc. The special abilities are revive for medic, trip mines for heavy assault, rocket grenades for light assault, air strikes for scouts, and ammo drops for support and tank killers.
You can get sniped but it's nowhere near as bad as CoD 2. The maps are much more open and there's usually a few different paths to get to each location. You will hate support gunners with a passion though. When they aim, they lay down on the ground and fire their gun, which is a .50 cal. Best way to get them is to either shoot/throw a grenade at them or hop around them and fire at them from their flanks.