I don't really care a lot about the fact that a military man has been nominated to head the CIA. Yes, I can see the concern that the administration is trying to put a bunch of lackeys in charge of everything, and I can see why, given the fact that the DoD intelligence agencies helped to make the false case against Iraq, people would be wary of putting a Defense guy in there.
But really, though, it's the civilian leadership that is untrustworthy, more than the soldiers. So I don't see a lot of problems with putting a general in charge of the CIA per se. Of course, this doesn't mean that General Hayden is a good choice, but I don't see his military career as being a detriment.
That is all.