I hear a lot of people thinking that Bush is an idiot. I think this is true only in the sense that he was an idiot not to realize that the presidency was beyond his abilities and to pass it over.
I think the reality is that he's a marginally bright guy (maybe even brighter than average), but he was put in charge of a very very very complicated thing. I think he did his best with it, but in the words of a novel I read once "he was like a competent Ford mechanic with a Ferrari on his hands." Except really he tended to screw up the normal businesses he ran too, so maybe it would be better to say that he was a competent bicycle mechanic with a Ferrari on his hands.
"Well I got the gas going to the cylinder tubes. That's what you gotta do right, a engine can't fire if you don't got the gas going to the tubes. Anyway, I did my best with it, history will have to be the judge. Heh heh."
And there's nothing wrong with being a bike mechanic. I like to tinker with them myself, but if you've got a beaten up stealth bomber that needs some work, I suggest you find someone else. And that, RIGHT THERE, is what makes me smarter than Bush.