Some of the questions about him are legit. The ones above about his athleticism are not.
He's also a very good ball handler and has excellent body control.
If he could consistently shoot 3s - and I don't think the jury is in that he can't - he'd be the #1 overall pick and there wouldn't be any question about it. There some video in the exhibition games Duke has been playing of him showing a pretty decent pull up jumper (with amazing lift, he'll be able to shoot over pretty much anyone), but we're going to have to watch him over the course of the season on his 3s.
On his D, yes, you can see him look sloppy, but let's be honest: he's spent most of his basketball life on D with half (or most) of his mind ready to take off for a youtube highlight dunk. With his athleticism, he can play D, it's just a matter of whether or not he's one of those guys who doesn't have a want-to.