It's tough to evaluate him. He went through 4 different OC/QB coaches in college and didn't have much supporting help. Yet, despite that he has a ton of autonomy to call plays, etc., and his mechanics are pretty good.
If you look at the stats of the OSU game you'd think he sucks or that it is impossible for a QB to look good in a 25 some odd point defeat, but he did look pretty good.
I think once all of the extraneous factors are taken into consideration he will rise up the draft boards, although football might not be his big love in life. ( He quit football in HS to play hockey).
Mismanaging the clock.