KC Joyner, one of ESPN's college football analysts, believes Michigan could challenge OSU for the East division in 2015. It's an insider article, but here are a few snippets:
The Wolverines ranked 25th among Power 5 teams in rush yards per game from November through the end of the season (186). Michigan also finished seventh in percentage of rushing plays that gained 10 or more yards in that time frame (7.8 percent). Some of that was due to facing Indiana and Maryland, but Michigan also racked up 14 rushes of 5 or more yards in its game against Ohio State. That total ranked as tied for the second-most rushes of 5 or more yards that the Buckeyes allowed against a Big Ten team last season.
wide receiver Amara Darboh looks to be up to the task of taking over as the go-to pass-catcher. Darboh had some flashes of excellence last season, highlighted by a Week 10 performance that saw him lead the Big Ten in receptions during that week. The Wolverines also return four other players who caught at least 10 passes last season, so whoever ends up as quarterback will have plenty of experienced receivers.
Last season the Wolverines held five Power 5 teams to under 100 yards rushing in a game. To put this into perspective, there were only eight other Power 5 teams that equaled or surpassed this mark, and no team had more than six games of this caliber.
EDIT - Blockquote not working...bolded sections are quotes from the article.
The article also mentions Harbaugh's success on special teams, being only one of seven Power 5 teams to return all five OL starters, a relatively easy schedule, the collection of talent assembled by Hoke, and Durkin's reputation as a turnover-creator. That said, it glosses over the big question mark at QB, asserting that Zach Gentry and Alex Malzone may both make a push to be the starter.