Sharon Katz of ESPN gives UM a good chance to start 7-0. According to the article
New offensive coordinator Doug Nussmeier should bring toughness and physicality to an offense that was wildly inconsistent last season. Nussmeier's first task will be filling the gaps in an O-line that allowed the most negative plays (sacks and tackles for loss) in the nation. With an improved line, QB Devin Gardner should be able to return to his 2012 form, when he had the highest QBR (91.0) of any player in the nation with at least 150 action plays.
I did not know that Devin had such a high rating in 2012. It then goes on to say
Michigan's toughest early-season test will be at Notre Dame, a game with considerable historical significance, as it will be the last scheduled meeting between the two schools. According to FPI, Michigan has a 55 percent chance to beat the Irish. In every other game through Week 7, the Wolverines have at least a 70 percent chance to win.
Three other teams are mentioned as being underestimated.