No doubt he's an odious person, but that (at least the part where he ditches jobs for better jobs) can be controlled contractually. But he's dramatically overachieved at both schools at which he coached. He took an average Louisville team and made them into a consistent top-10 team, and took a sinking Arkansas team and made them into a top-10 team as well in a ridiculously hard division.
He might be a scumbag, but his on-field coaching is great.