The thing is he was also a bad general so it's not like there's an excuse for the shit personality and massive ego trip.

King and Nimitz spent as much time managing him as they did dealing with the IJN. And when he was let off the chain without another branch to keep him in check he complete fucked up Korea and turned what should have been a walkover into a meatgrinder by walking up to the Chinese border (and probably crossing it if we're being honest).