Way back before the season started, I heard an NFL scout mention just as Mayock did that there are tendencies in McFadden that really don't translate to the NFL. The biggest knock on McFadden was that he doesn't attack the line of scrimmmage in a way that is needed at the NFL level. At Arkansas its all about motion, misdirection, to option or not, and rarely did McFadden ever just get the handoff out of a traditional set.
Not bashing McFadden. When he does break free he is fantastic, but I do agree with Mayock that there are some things about McFadden that make you wonder if he transitions well to the next level. As for Mendenhall, there is no doubt in my mind he will be a bigtime player. I was at the Rose Bowl, and seeing him in person out run a very talented USC on that 79 yarder and then again on the screen pass for 50 plus yards was very, very impressive. As another mentioned, Mendenhall was the offense for Illinois in that game and it wasn't like he was playing against a cup cake defense. The USC defense is awesome.