All he does is dunk? Griffin had 192 dunks last year out of 561 made FGs. That's a lot of non-dunks he's making every game. He's had many games of 40+ pts, which is just not possible for a big without scoring versatility. He has been a consistently great rebounder even though his front court has featured seven-footers in both years; whether that is because he boxes out well or has a "nose for the reb" or is just plain lucky is irrelevant.
Morey would trade every player on the rockets for blake. Might be overpaid, but there are five super stars in the league and he is at least in the second tier.