Well, I do believe that the Packers are the underdogs here. I mean Seattle is a really, really good team and they are at home. I don't think Seattle's offense is that great, good, not great, but they do complement the defense very well in having the #1 rushing attack in the NFL. You keep the other offense off the field and when they are on the field, the Seattle defense is fresh and coming after you like gangbusters. It's a very potent combination. And Russell Wilson is almost the perfect QB for the Hawks: great scrambler, play-maker, cool under pressure, does not make many mistakes and has a good enough arm to do damage if the other team sells out stopping the run.
Having said all that, a team that has to face adversity can often use it as a great motivating factor, and I think that the Packers have that potential. They're a proud team, they're dissatisfied with their playoff performances from the past 3 years, they have the leadership this year they didn't have before in Julius Peppers, their rookie class been absolutely outstanding and is light years ahead of what it was at the beginning of the season with Linsley at C, Davante Adams as the #3 WR, Haha Clinton-Dix at FS and Richard Rodgers at TE. Packers are simply a better more well-rounded team than they have been in the last 3 years. And the injury to AR? That also can steel the nerves and make him and the Packers play with a determination under very hostile conditions that few expect of them.
I notice the Packers haven't been saying much. You can interpret that as being lack of confidence or fear, or you can interpret that as the quiet determination of a team that knows what it's going up against and is going into the game without fear and to do what few expect them to do able to do.