While the overall recruiting ratings would not be accurate for the reason you mention above (attrition), the actual ratings of the players that are starters on the depth chart show Nebraska with the slightest edge over Minnesota, and more of an edge over Indiana. If you looked at the ratings, and everything else was equal, you would say that Nebraska and Minnesota should be in a close game, and Nebraska should win comfortably against Indiana.
So, I think Undone's interpretation might be closer to the truth than the "no talent" argument I keep seeing.
A few notes:
1) The rating is from 247 sports, which I feel is a fair evaluation of talent
2) I got the depth charts from the team website. Just seeing Nebraska's week-to-week, the depth charts for other teams may not be 100% accurate. If there are mistakes, I would be happy to fix them
3) There were two players for Minnesota I couldn't find a composite rating for: Sam Renner and Jordan Howden. From what I understand, Sam is a walkon that had no other offers; Jordan had one other offer from Idaho St.
ratings.pdf