A lot of posters point to his grabby hands and poor tackling.
The poor tackling, I'm not so sure.
Either way, at 6'1" 200lbs running a 4.4 forty, this guy is a tremendous prospect.
He averages one to two holding calls per game. I think you live with that if he's holding opposing QB's to a 40ish rating in his area.
I was thinking along the same lines as you. I'm not sure about the tackling, he seemed sound on film that I saw, but the comments by the experts worry me. On the grabbing I guess it matters on the timing of the calls. Devastating when it prolongs the drive on a third down and the good defensive shutdown, but then again if it's only 5 yards sometimes you can survive it.
I guess the bottom line is you wouldn't want your whole secondary playing the same way, but maybe with one you can live with it.