I think Robinson is mediocre to below average in pretty much every category. He's not awful, but he's a JAG. Mediocre speed, below average vision, mediocre agility, below average burst. He's a guy who will get you some yards as long as you put a top notch OL in front of him. Otherwise, he's not going to do a whole lot and he's certainly not going to scare anyone.
The only reason our running game was even remotely respected last season, and the reason that teams didn't just constantly drop a bunch of guys into coverage, was because of Daniels. Without the threat of Daniels I think Robinson would have looked even worse last year. Having him as our #1 back again is concerning. (Though let's be honest, he's not our #1 back, JD is).