I'm good at fast paced shooters. (Halo 3, Shadowrun, Counter strike: source, Crysis, etc)
Not so good at 'Hurr hurr lurk lurk lurk' or 'durr hurr I see you first I get kill 100% of the time' games. (CoD)
CoD is its own level of garbage shooting. I'll say this, it's more realistic then other shooters, but they've proven that's a bad thing. Games where lurking/camping WILL indefinitely always be the best strategy is just not a shooter I ever want to play.
But otherwise, Halo 3 i've usually got a +20 K/D ratio in team swat, and maybe an average of +10 K/D in all other gametypes (excluding objective, which is all over the map)
Shadowrun i'm usually top 3 of my team every game.
Counter strike source....used to play at a pro level, but have since stopped playing so hardcore.
I can destroy on CoD, but I just choose to not play it because its just overall a crappy/boring experience. When I do I just use my knife class and piss everyone off in FFA or S&D.