I thought the way he approached Mitrione and tried to start a fight over an injury caused in a fight was low and unecessary.
That said, Marcus was the best thing about this season. Really likable guy with surprisingly good ground game.
I have watched some of his fights before TUF and its evident that he has no chin. In the heavyweight division its really hard to do well with a weak chin, and I'd put Marcus in the category from what I've seen. Maybe he received too much damage from football or something, who knows, or maybe he just doesn't have an iron head like fighters such as Rampage and Henderson have. With bad standup and no chin he's not really cut out for the big time.
He'll beat Mitrione but I don't see him being much of a threat in the heavyweight division. He's a personality though I really like him