The Cards just landed a legitimate feature back, someone who will someday deserve 20+ carries a game. He's built to run between the tackles and hits top speed in step 2. He has unbelievable feet and balance, not just for a big man, but for any back.
The ONLY reason he didn't go among the first 10 was his history of nagging injuries, a judgment passed over a very brief period of time, and not the type of injury that you would expect to reoccur over the course of a career.
I'd say the Cards hit a home run with their first pick. They weren't just filling a need. They drafted the best player available (and then some).