I have seen Mendenhall play quite a bit and he was a stud in college. It is yet to be seen whether Mendenhall will be a stud at the next level. Heck if you looked at Slaton after his soph season he could have been one of the earlier RB's off the board.In the 2005 NFL Draft when three RB's went in the first five picks the two more successful RB's went in the 3rd and 4th rounds in Frank Gore and Barber respectively.
IMO in today's NFL RB has become a position by committee. Their isn't a great difference between the top backs and the lesser hyped backs. I just feel it is foolish for the Bengals to waste a top pick on a position that isn't in that great of need. DT, S, DE, LB are all greater positions of need than RB.