Cataclysm was a perfect example for me. When I didn't have anything else to do, I could power through three hours of slow gameplay until I finally amounted to something. I find myself a lot worse at fast games. Anything multiplayer, I'm gonna lose. I've got no real reaction time; half of any kills or wins I get'll be reflex or luck.
I can play UT2004 with the bots on the third hardest (out of 15 I think?) difficulty level, 20 at a time, on instagib mode. I'm good at games, I just get bored easy.