I was pretty back and forth on CCQ all season, eventually "switching over" to team CCQ. Here's what I think, most of Coffman's success was due, in large part, to Daniel Thomas. Defenses knew that first and foremost, you've got to stop Thomas and try to make Carson win the game. When that happened, Coffman was generally pretty effective at hitting receivers >15 yards down the field. He couldn't stretch the field vertically, at all, but he was hardly ever called to do that, probably because OBz and co. new his limitations.
So, in summation, Coffman was a decent quarterback who generally did a good job of exploiting vulnerable secondaries. Carson did not lose us any games.