I might be the only MCW fan here, but I think he earned the ROY for a reason.
He's long, a good defender and a team player. If he improves his shot, he'll be really good.
IMO the reason he is so undervalued is he almost never produces flashy highlights like Rondoesque assists or dunks a la Westbrook. But he is efficient. You can tell by the way Philly plays tonight, they are way worse than usually.