I know most of you probably don't know much about Campbell, and I wouldn't expect you to. I have watched every Michigan game for the past umpteen years and have some ties to the Michigan Footall program. That being said, this is my breakdown of your 6th round pick.
Campbell has 1st round size and strength. He has 1st round talent. He has had 6th round production. He dominated high school by simply being stronger than everybody and found out, the hard way, that doesn't fly in college. He needed to be worked with and taught fundementals (stance, pad level, etc.). The problem is, as most of you know, Rich Rodriguez completely neglected the defense. Take a look at the turn around Campbell has had under and NFL D Coordinator (Mattison). He has completely transformed his body and attitude and the results followed suit.
Don't be fooled by the felony charge he had last year. You won't find a better personality. He was one of the most liked guys on the team last year. He tried to pull a Duke's of Hazard esque hood slide as a joke, but 340 pounds doesn't tread car hoods too well. There was no chance that felony charge was going to hold, and it didn't.
Campbell's biggest issue in college was technique. He was not good at "playing low". A switch to offensive line might be huge, because 50% of the time you aren't trying to be low. If he plays guard for you guys, then that number increases (leverage isn't needed when you pull). He moves pretty well for a guy his size, so I think he will be fine with a transtion to guard.
Lastly, he is very young. He was an early enrollee at Michigan and also graduated a semester early. He graduated with a 4 year degree from them Universtiy of Michigan in 3 1/2 years, at the age of 21.