I think he is a very good coach. I don't think he is great. I think he won the title(s)? at the U through his recruiting violations. A lot was dumped in his lap when he got to Dallas, but I will not take his two Super Bowls away. He earned them (and probably should get credit for the third as well).
But to clear up the Miami Dolphins situation, he did not do a very good job IMO. He cleaned house, rebuilt and did not improve the team. Yes Marino was at the end of his career, but he was still playing great football until his last year when he was hurt.
And finally, what is this about a crummy GM? HE WAS THE GM!
JJ = GM
Once again, I am against his hiring not because of his coaching abilities, although he has been out of the game for 7 years and his last stint was unimpressive, but because of his character. Plain and simple. I couldn't root for him.