I will say that he got them TO the Superbowl. If they wouldn't have won against New England and Cincinnati then they wouldn't have been the #1 seed and probably would have lost a road playoff game.
That being said, everything else was the Denver Defense! Brock will be lucky to make the playoffs again in Houston. Then again, what do the Broncos hope to do without a QB? I guess they could just punt on first down and let their defense play all game long.