For a long time he was pretty much as perfect a coach as it can get. The preparation of his players, the game planning, the in game adjustments and decisions, the psychology of getting the most out of and disciplining the players. And a very good gm on top of that. He was overshadowed by Brady because of how good Tom was especially towards the end but you cant ignore how great BB was.
Not to toot my OWN horn but Hes the coach i found myself disagreeing with the least. Also 4th and 2 was a great call imo. Cant believe how much crap he got for it. Id have done that 10 times outta 10.