Well, I'm readying my flame-proof gloves, but the game I'm REALLY good at are Multiplayer Call of duty and Halo. Most recently, MW2 and Halo: Reach. In mordernwarfare, it's not uncommon for me to go 20+ to 0 (And this is in a standard Team Deathmatch game). In Halo, I think my best was in Invasion on Boneyard, going 58 for 3 and capturing the core, and I got about 52 of those kills with the DMR and Needle Rifle.
Oh yeah, and Red Alert 3 for xbox. The only time I ever lose against online players in when my Team-mate is god-awful, or in a one on one (This happened to me at least a few times) when I come up against the top player in the world. DAMN YOU GBH_Michael!