Which instrument is right for me if I decide to play Rock Band?

I was going over some of the on combos for all the instruments I would need, and decided I'm a hopeless bum when it comes to guitars. I'm looking at drums or vocals, but I need an idea of what I'd be better suited for. Vocals seem easy enough, just train your pitch and tone. Drums, it seems like you need fast wrists and coordination with your hands as well as natural rhythm. Does anyone have a more in depth description for what's required to be a good Rock Band drummer before I make a decision?