Fact: The Vikings had a BYE in week 9, thus giving them 2 weeks to prepare for the GB game.
Fact: The Vikings had 10 penalties against GB for a loss of 80 yards.
Conclusion: The coaching staff is allowing the players to play undisciplined football

Fact: Leslie Frazier was a starting Cornerback for a Super Bowl winning team in the NFL as well as a highly regarded defensive coordinator for the Vikings before eventually taking over as head coach.
Fact: Asher Allen and Tyrell Johnson continue to see playing time in the Vikings secondary, despite never succeeding as "starters" on a weak secondary.
Conclusion: The coaching staff is making a mistake in playing these guys, and haven't shown that they can coach up average talent to over-perform.

Fact: Musgrave wanted to get Adrian Peterson more involved in the passing game after they found success in week 8.
Fact: Adrian Peterson recorded exactly 0 catches on 1 target during the GB game.
Conclusion: While Frazier isn't calling the plays, ultimately he's responsible for the gameplan each week, and this is a huge mistake to target Peterson only once in the passing game.

Overall Conclusion:

Leslie Frazier has the reputation as being a "player's coach", and IMO this is directly responsible for his sticking with aging veterans when they are clearly beyond their prime (McNabb, Cedric Griffen, etc).  It also explains the undisciplined football we see week in and week out.  The team looked completely unprepared for Green Bay, and it doesn't make any sense considering they had an extra week to prepare.  How can the secondary be so bad when our head coach PLAYED CORNERBACK in the NFL?  What kind of gameplan doesn't try to put the ball in Adrian Peterson's hands as much as possible, even in the receiving game?  IMO, this loss falls at the feet of the head coach.  I'm beginning to think that Frazier doesn't have what it takes to be a head coach.  Getting blown out after a BYE week is unacceptable.  I don't care who the team is, and where the game is played, losing 45-7 is unacceptable, and I put the blame squarely at the feet of Leslie Frazier.