Recruiting rating services are the Rorschach test of college FB - everybody sees what they want to see. My cynical nature tells me that, if your school gets a high rating, you think the system is just fine. If your school gets a low rating, then the system is invalid.
My feeling - the ratings have some merit - more so on the real blue-chip players who get a full evaluation and play against top competition. But for players who may be geographically isolated, or don't play against top competition, the ratings become more iffy. Unfortunately, at this stage of the program, the players the Gophers tend to be recruiting fall into the category where the ratings may not be as accurate.
And - evaluating and predicting the development of 17 and 18-year old kids is never going to be an exact science. too many variables - some kids have hit their full growth, while others may still be developing physically. And, until they perfect mind-reading, you're never going to be able to look into a kid's head and heart with 100% accuracy.