Michigan has gotten its share of 4- and 5-star recruits throughout history, but obviously, not all of them have panned out.
Still, everybody knows that that is simply part of recruiting, knowing that a number of the players you sign won't make it at the college level.
The reasons obviously differ, but I'm going to avoid guys who were busts because of injuries in this article. Also, no players currently on the team make this list, as those players still have a chance to shed their "bust" status (ex: Will Campbell).
There are obviously no right or wrong answers to this list, so opinions will vary wildly.