Off the ball he plays real well, especially with LeBron. On the ball, he is terrible. He ISO for a long 2 point shot everytime. He doesn't have the quickness to beat guys off the dribble unless they are a slow footed big man.
He would play more consistently with a PG to take him off the ball. You can see his high basketball IQ off the ball, he cuts, moves to the right spots, and positions himself for rebounds well. The problem is his tunnel vision and he has lost a step or two, making ineffective on the ball.