You could give me a whole menagerie of playable races, or a galaxy full of sentient species, and I'll almost always play a human. For whatever reason, I always feel like I have to play to "type" whenever I play another race - Elven rangers, druids, or mages, Dwarven fighters or maybe clerics (though I still don't "get" clerics), Half-orc barbarians, etc. Humans, though, have no "type," so I can run with concepts like a hyperactive kid running with scissors.
However, give me the means to create my own species (or race, or whatever you want to call it), and I'll be happy as a pig wallowing in whatever pigs are happy wallowing in.
