For Michigan State, folks were expecting a rough year (although perhaps not this rough). They had a difficult change of coaches, leaving the team in a tough spot, with a disrupted the program, recruiting class, and replenishment of players.
For Michigan (and Penn State, and to a lesser extent LSU), it is shocking. Those programs have plenty of good players, plenty of resources, and highly experienced coaches and staff. Whatever the coaching staff did to get the team ready for this season, it clearly didn't work.