Guess I really have to research Bolton; I am not all familiar with him other than from what I'm reading about him in here. :(
He's good. Smart as a whip, well connected internationally from his time at the UN, has a better and more realistic grasp of military abilities than half the brass, and isn't afraid of speaking clearly or saying no. He's also unusual in that if he doesn't know something, he admits it up front and he's not instantly dismissive of things "not invented here."
Yes, his writings have been a bit OTT at times recently - not denying that. He's still the best option I've seen floated, by far.