You can't deny Overeem's stand up, clinch, ground skills. I just question his heart and training. I think he IS one of the best HW's in the world if his mind is right. I think he thought that he was going to go in there and bully Bigfoot around, or, that Bigfoot was going to play it safe and he would just land a good strike and TKo him. Bigfoot brought it to him though. Hopefully Overeem learned a valuable lesson. Never underestimate any real fighter in the UFC.
If he is training with Badr Hari, maybe Hari can show him a thing or two about dedication. That's pretty crazy though, arguably the two best strikers in the world training together. That's like Velasquez and Cormier wrestling around together. If I was a fighter and I had the money, I'd train with those guys in a heartbeat.