Keep in mind that Woody was a diabetic who was not good about maintaining his prescriptions. The older he got the more prone he was to miss them and this would result in erratic behavior. It has been shown that he was not properly dosed during the Clemson game.
He was firey and zealous, but he was also a great and decent man who did many, many kind things for students and players, sometimes many years after they had graduated.
Urban Meyer has a picture of Woody in his office. He idolized him, and no doubt he is a huge influence on his coaching.