I'm pretty uber at many of them. I've won several tournaments - over a dozen SF related ones, a couple VF2 tournies, Tekken, Tekken 4, Indy 500, X-Men vs SF, and X-Men COTA. Those are all the ones I can remember off the top of my head. I'm also pretty damn good at FPS games on the PC - but only on the PC as I need my keyboard+mouse combo. I like to think of myself as a collector though - supporting all the companies I truly love. These are Square/Enix, Capcom, SNK, Namco, id and anything that the AM2 team or Miyamoto releases.
Oops - forgot to add Team Andromeda
and Treasure.