It's the preseason, "We are going to be great" hype. Then the games start, and the head scratching choices he makes begin. It's all the in game decisions that he makes that show how good or bad he is.
If you rate him on kindness, being religious, and being a good guy he should be given an A. If you rate him on coaching ability then the season and his ongoing decisions will grade him. From past seasons he doesn't have an A.