I agree, antidotally of course. I know plenty of people who are very intelligent (by most measurable ways) so they could do any profession they like. CS is a good profession right now so they picked it. Definitely no passion, but given their high functioning brains or what not, they are good at whatever they do.

Don't get me wrong, I believe most who pick this profession due to its perks, tend to be worse then their computer inclined counterparts; but there are lots of examples of this just not being true.