His defenses at Boise State, Washington and Tennessee all showed improvement and were solid units.
His raw numbers at USC weren't great, but their efficiency numbers were all in the 20s nationally. They certainly had talent but the depth was pretty sketchy with all the recruiting sanctions. The head coach showing up drunk to practices and games probably doesn't make coaching the defense any easier either.
I certainly don't think he'll be another Aranda, but I think he'll be solid, and possibly a better recruiter. I've also heard that the 3-4 is here to stay due to the type of kids Wisconsin can more easily recruit.
The Badgers went 10-3 with a loss to Bama, loss to Iowa by 4 with a Stave trip/fumble on 1st and goal inside the 5 in the final minutes, and a loss to Northwestern by 6 with what seemed like a game winning touchdown being overturned for whatever reason.
Next years schedule is pretty tough, but I think the defense will be elite and the offense could be better. I could see them anywhere between 8-4 and 10-2.