I'll agree that many of the things he says are reasonable. An example is his recent defense of long lines and dismissal of the insane "80 characters per line" peeps.
What I mean specifically by "uncontrolled lunatic" is that he often ignores convention and current opinion and does and says things that get him into trouble. He also has a temper that he often is bad at controlling. I myself have this issue, and I don't see how one could say he does not have issues in this regard.
While it requires some amount of perpendicular thinking to be a master of software, having such an attitude and working with other people in that way will cause too much conflict that is unnecessary.
I think what you are missing in my statement is that I consider calling someone an "uncontrolled lunatic" as a sort of compliment.
I agree also that he is less of a technical person and more of a manager. His skills lie in herding.
On the other hand; Git is a flaming piece of garbage and he is directly responsible for its popularity... so... He did though reasonably tell people he didn't intend for anyone outside of kernel developers to use it. I just wish he corrected its deficiencies. Maybe someday he can apply his "arbitrary character restrictions are silly" logic to Git comments and become less contradictory.