I actually created a thread about A.J. a month ago.
http://www.thecoli.com/threads/and-it-happens-nfl-scout-compares-a-j-mccarron-to-tom-brady.169432/
Short summary:
Strengths:
Short Accuracy
Quick release
Excellent footwork
Elite Football IQ
Lighting quick eye
Understands when to throw with touch
Strong v. the blitz
Has moxie
Toughness
Winner
Good velocity on short and intermediate throws.
Willing to make plays when needed and does.
Weaknesses:
Arm strength
Size
Needs great development in terms of accuracy. He can throw players open at times but not often.
Needs weight training
Nothing special in tools or talent
decent mobility for a pocket QB
All in all, system QB, needs development, could be special in time with the right team and coaches. In today's NFL, he really needs the right situation. Will draw comparisons to Andy Dalton but Dalton is more talented out of TCU than A.J. out of Bama but A.J. has less flaws as well leaving room for more potential. While I say he is a better Matt Cassell right now, I will say that his peak potential might be Tommy Legend. But don't bank on it.
2nd round grade.