I'm pretty bad at fighting games. Accept the Smash Bros games, but not actually a "technical" fighter. Guess the main problem for me with those, is I don't like having to learn moves haha. Talent should separate you from the next player, not the amount of time ya study the game haha.
Other than fighters, I'm not so hot at a lot of racing games, although I WAS EPIC at Burnout 3. Was in the top 100 online at one point in time back on the Xbox. But when it comes to sim racers, just doesn't happen. But never really give sim racers the amount of time others do because it bores the hell out of me.
I'm sure there are other genres, but those are the main two.