He may have a good career, but dont look for him to be a superstar. He is too small to play Center in the Pros, and will have to play Power Forward. Plus he has a recurring back issue, which is never good. Especially for a College kid.
He is worthy of the #1 pick, but I would not be surprised to see Dwight Howard turn out to be a better player in the long run. He's been compared to Tim Duncan, but with most High School kids will have a big learning curve and may end up being the next bust.