What do you think of mysterious guys/girls?

Well, I like mystery but up to a certain degree. Someone who only wants to know about me but reveals little to nothing about him/herself doesn't really interest me. I think stability underneath a cloak of slight mystery is really nice. Because mystery alone can carry other things with it. Someone can be mysterious but underneath it all be controlling, or angry, or weird. So I think mystery is overrated and stability is underrated. But yea, maybe I'd prefer a slight introversion with stability underneath.