It is the most consistent, valid criticism of the Les Miles era: For whatever reason, a staff that has put more players in the NFL than any other program has been unable to recruit and develop a quarterback over the past decade.
Pick an embarrassing loss. Choose a disappointing season. The crux of the issue most always leads back to problems under center.
In 2006, Miles chose not to sign a quarterback. In 2009, he signed two, neither of whom ever took a snap under center as a Tiger. There was 2010, when Miles put his eggs in the Zach Lee basket, knowing there was a chance the baseball phenom might choose to sign a pro baseball contract and forego football.