He is a very effective player, if you use him right. He is super athletic, a very good shot blocker, a strong rebounder, and an ok overall defender. He can be effective offensively on a team that runs a lot, because he runs the floor well and has great hands. Bad ballhandler, bad passer. If he gets the ball down low in a half court situation he doesn't know what to do with it. Horrible free throw shooter.
To his credit, he doesn't try very often to do offensive things that he can't do - which is everything other than finish on the break, catch and dunk lobs, and the occasional putback. He would be a big upgrade from Gortat.