I think you should also judge him on his performance at FAU. If he is a good coach, he would do better than 4-8 and 8th in a very weak conference. A very good coach would build a winning culture and field good teams. Let’s see if he can do that before defining him as a good coach.
He was headed for a major train wreck at Texas. Recruiting was sucking, his players and coaches resented his arrogant behavior and his personal life was in shambles. All of these factors help define you as a coach. At this point, it would be a huge stretch to define Herman being a good coach.