My thing with Harden is I think he's one of those guys that has had to prove at every level that he's good enough. In HS Malik Story was higher rated early on, but Harden became the star. In college he came in highly regarded but everyone said he's not on the Mayo, Rose, Bayless level. Now he's headed to the NBA and again it's he's not athletic enough or he can't play defense etc.
I don't know that we really know yet about his defense, they play zone so how could we know? He gets a lot of steals.
Offensively I think people overlook how much defensive attention he got, very few teams just played ASU straight up man, most used some sort of defense geared to stop Harden, from USC face guarding him with Hackett to UCLA throwing 3 different players at him(jrue, Shipp, Lee) and constantly using Collison to double him(which is why Glasser was so good against UCLA).
He did have Pendergraph inside to help but for Harden to put up those numbers while being absolutely keyed on impressed me.
I don't see him as an instant star, he needs to improve his outside shot, get a quicker release. He'll need to adjust, rookies in the NBA rarely get calls, he got a ton of calls in college driving in and creating/causing contact, he might not get those calls in the NBA early on they may be charges or no calls. But he's just so good at finishing inside with contact and he's a terrific passer so I tend to think he'll eventually be a really good player in the NBA.