He was hired because he was supposedly an offensive genius. In 3 seasons as not only the Head Coach but the Offensive Coordinator as well, he went 7-10 three times, finishing with a 21-30 record.
Number of playoffs appearances: 0
Number of 30+ point games: 0
Score of his final game (with still a small chance to make the playoffs): Loss to the Saints (ugh) 49-17.
The team was not improving. It was time to move on.