I wouldnt mind Harbough, although a lot of people hate him. Look what he did with Kaperdick in SF in just 2 years.....
Harbaugh started coaching at the small school University of San Diego when my daughter was a student there.
He coached quarterback Josh Johnson who surprisingly made it to the NFL and is still a backup.
He went to Stanford which had a losing record the previous 10 seasons. He took a weak QB and turned him into a decent game manager and improved their record.
He then recruited and groomed Andrew Luck.
With the 49ers he turned Alex Smith from failure to pretty good. When Smith got hurt he had success with Kaepernick who was very raw.
So yeah he’s been pretty successful. I don’t know what happened at Michigan.
What I’ve heard is he’s such a control freak that after about 3 years no one can stand him.