Mac came up with some of the best game plans I have ever seen. How many times did we jump out to a lead against a much better team....I remember quite a few. However, his HUGE downfall was making in-game adjustments. We would get the lead, and then get blown out of the water in the 2nd half. Some of this was being conservative, some was just being out-coached. This was by far the most frustrating thing about Mac, and ultimately why I was ok with us getting a new coach.
Chizik was poor on both accounts - coming up with a game plan and in-game adjustments/calls. I've never seen such poor adjustments on the defensive side of the ball, and such poor play-calling on the offensive side (particularly in the red zone).
To me, our biggest deficiency the last couple of years was coaching. We definitely lack in the talent department.....especially depth-wise.....but clearly there are coaches out there (Boise, Utah, Wake, etc) getting more from the guys they have on the roster. I believe we are very close to having the talent to make it to bowl games on the roster right now. We lack somewhat on defense overall, and possibly on the OL. That said, if the current guys can grow a little, combined with some good coaching, we will be able to make bowl games soon.