I thought this was interesting.
2007, 13-3, lost in playoffs to superbowl winner
2008, 6-10, transitional year
2009, 11-5, lost in playoffs to previous years NFC superbowl team
2010, 10-6, won superbowl
2011, 15-1, lost in playoffs to superbowl winner
2012, 11-5, lost in playoffs to NFC superbowl team
Since 2007, the packers have either won the superbowl or have lost in the playoffs to the NFC team that went on to play in the superbowl in all but two seasons. In one of those season, they lost to the NFC team who was represented the NFC in the superbowl the year before, and the other season, they had a horrid defense and were lead by a first year QB.
Its easy to sit back and find things to complain about this time of year, and certainly there are a lot of heartbreaking losses on this list, but you have to give GB's front office, coaching staff, etc credit for putting the team in a position to compete year in and year out. That's not something you can say for the majority of teams in the league.