Uh. Ok, let's try it.
Modern FPS: Half-Life 2 (Where's Mah Episode 3 Valve!?) uh yeah and Portal
Modern FPS What Plays Like Retro FPS: Serious Sam series
Retro FPS: Duke Nukem 3D
Platform: Oddworld series
Action Adventure Platform: All 2D Metroids, and all DS Castlevania games (and Aria of Sorrow and Symphony of the Night)
Western RPG: Neverwinter Nights
Eastern RPG: ...umm, I think maybe Final Fantasy IX, that was great
Action Adventure RPG: Okami tied with the Kingdom Hearts series
MMORPG What Should Be a Real, Non MMO RPG: World of Warcraft (I mean, I love the game, but I hate those fags, why I can't do a Raid ALONE???)
Old Regular Shmup: Tyrian (the original one; I mean really, Tyrian was my Childhood, I wouldn't be here without that)
Danmaku Shmup: Touhou (No way, really?? Haven't guessed. SA is my fav, and the only one where I can't 1cc Normal)
Real-Time Strategy: Warcraft 2, Starcraft and the Command & Conquer series
Metal Slug-like I-Blow-Up-Everything Action: Metal Slug (duh)
Fighting Game: Windows (I'm pretty good at it, it never crashes for me-- what the hell is this error message-