Hoping for a healthy/productive season for Tyler, I think he's a legit NFL talent.
Iowa has had a lot of success over the Ferentz years with mostly, let's face it, Great Value type runningbacks. Good, but not great. Shonn Greene was great. Jermelle Lewis was on the road to great pre-injury, I think.
This style of offense can be almost unstoppable with a "5 tool" type RB like Tyler. "Unstoppable" is more than a little hyperbolic I suppose, but at least really, really un-fun to defend against.