In my head I was thinking 4th round. I can't remember what damn day they do what round anymore. I liked it before when it was on a fucking Friday/Saturday.
The length of time that a running back is useful to a team is becoming shorter and shorter, and the talent disparity between college and the NFL is all but gone. So when you can pick up any random starting RB from a D1 school and plug them into your team, where they'll start for 3-4 years, I think it's ridiculous to use a 1st-3rd round pick. Add in the fact that most teams are using a RB by committee you're basically left with Peterson as the only RB worth where they were drafted.
Use your 1st and 2nd round picks on defensive line, linebackers, interior offensive linemen, and DB's, only making an exception if there's a freak at QB or WR (basically if you have the chance to grab the #1 or #2 WR on the board, and you need a #1 receiver, you take it). Starters for everything else can be found in the 3rd and later.