I think he's good. I just would put him around the 12-15 range. He's definitely dynamic. The defense was one of the top in the league the first time he made the playoffs. The second time, he carried the team to a 7-9 playoff birth in the worst division in the league. It's still the playoffs, but not very impressive given how historically bad the division was.
I think he decides to run too quickly, but he could get better at that. We'd be Super Bowl favorites if we had him, IMO.