Team rankings on 247 are a joke.
Iowa - 2 four star, 16 three star - #6 class in the Big Ten
Minnesota - 2 four star, 16 three star - #13 class in the Big Ten
#6 looks like you are doing a solid job recruiting, #13 looks like you are doing a horrible job.
There are 3 classes on paper that are significantly above the rest of the pack in the conference (OSU, PSU, Mich), the rest are just a big jumble of teams where a small change in the player rankings would have a sizeable impact on the team ranking without really changing the true makeup of the class.