I think his play speaks for itself. All along people (at least I have) been saying that Tyreke is going to be unstoppable offensively (of course no one is actually unstoppable, but defenses will have a very hard time with him) if he developed an outside shot. His ability to get into the paint is unquestionable, and when healthy he's able to finish at a good rate. On defense, he is certainly at very least an average defender, and considering that he's only in his 3rd year most people would say that he is a pretty good defender. Say what you want, but not every rookie/2nd year man can steal a ball from Jason Kidd. Basically he has the natural tools for defense - long arms and strength, that will allow him to guard PGs that aren't too fast and most SGs.
That said, his biggest weakness outside of shooting appears to be in his decision making. He has not displayed the kind of court awareness that point guards generally have, but he is able to set up his team mates because of the attention that he draws from the opposition. The thing is, nobody in their right mind expects Tyreke to become Steve Nash or John Stockton. Every person saying that he's got the makings of a superstar is putting him in the mold of a more Wade like player, or a better version of Joe Johnson. None of those guys are natural passers either, but they do get the job done.
Give him time to adapt and learn. In my opinion, the real question is his work ethic. Kobe Bryant didn't become the player he is by relying on his athleticism. If Tyreke is willing to be humble, to work hard on his game, I don't think there's any question that he will be at very least an All Star some day. I am worried however, that the coaching staff may have/ continues to give him too much free rein, and as a result he may not realise that he's overdribbling etc.