League of Legends- I'm not bad, but I'm certainly not as good as I want to be. I used to be so awesome at a lot of MOBA maps on WCIII.
Dawn of War II- I suck at it. Plain and simple. I can't play RTS games that are mobile for your resources (I.E. capture-point based resources). Even then, I'm not great at RTS games but I can scrape by at things like Red Alert and StarCraft.
Call of Duty/FPS- It's soooooo fun, but I'm sooooooo bad! D=
Super Street Fighter- I suck because I pick low teir characters like Dan but I don't seem to be able to get good with higher tier characters. Also, I suck at "quarter turn" fighters, which is every competative fighter ever.
I'm sure there are a lot more, but I can't think of them right now.