I like to pretend it's just because the Doctor mostly hangs out with humans. Probably all species in the galaxy suck about as much, maybe in different ways. Except for the Ood, they seem all right.

Ah, right, Autons. I should really just tune out all of those "Behind the scenes" features they keep showing. If only because I prefer not to have characterizations/motivations spelled out to me in a way that drives me nuts.