There are only three games I play online at the moment. GTA, because it's perfect to let off some steam. A group match with rocket launchers = fun. Until you die... and die again... and again... again... but it's fun.

Far Cry 2. I like playing hide and seek. I hide near a spawn point, and get people when they come back into the game. xD;

Soul Calibur IV. I'm still learning the controls, and despite being a noob in it, it's satisfying when I hit the "You Win!" screen.