There's been so many reports that he acts incredibly entitled, and arrogant. The fact that when you draft him, you're more then likely drafting Deon, because any coaching that will occur will be told to Deon who may disagree.
To put it another way, you may have a young quarterback who isn't all that coachable, he's never had a coach, other then his father. Reports him acting arrogant, entitled unwilling to do what the teams asked during the interview speaks volumes of how he'll be in the clubhouse.
With that said, I think him landing with the browns is one of the best places for him to learn and grow. They have a good team, and if he's wiling to show the nay sayers wrong, and put work into his craft he could be a very good player.
One thing I'm curious about is, what will his agent (his dad) push for a rookie contract. Being drafted in the 5th round, the amount of money he'll get probably get is sub 5 million. I know the NFL restricts rookie contracts to a great degree, but it may be interesting to see this play itself out.