Patience is the main one.

It really depends. Genreally I guess one of the things is good hand-eye coordination and muscle memory? I guess once you play enough of them you're good at picking up patterns in future games, too. I don't really play "competitive" games as I stop having fun once it gets to that level. I'd rather be mediocre at 20 characters than be good at one because it's a lot more interesting.

You get good at a game if you play it a lot and that's basically it.