He is a headcase, and I think his talent is overrated. He has a well rounded game, but he is not great at anything, is not explosive, and looks like a tweener to me. He is the kind of guy you take a flyer on in the second round, because if he can get his head right, he could be a useful player...like a smaller Boris Diaw...but in the first round he is not worth it.
I think people are pumping him up by saying he would be a lottery pick if he didn't have character issues. I think if he didn't have character issues, his talent would get him drafted in the late teens or twenties. With the issues, he drops IMO.