@Robert Gentel,
In my mind, it's a case of the lesser of two evils.
Bush not only invaded Iraq on a pretext, but then occupied it and threw away money (and worse, too damn many lives) building and rebuilding their infrastructure.
Sure, we wouldn't have gotten Bush back again, but we would have gotten someone a lot more hawkish than Obama (IMO).
Do I agree with the drone attacks? No, I think they're counterproductive, as you've pointed out.
Do I think someone else in the White House would be as bad or worse? Damn straight.
I support Obama over his rivals, but I disagree with this particular policy.