The timing of their issues is the part that is different. Last year they struggled early and we often used (09/10/12) to have a lot of discussion 'round these parts during the first 8 games about the offense struggling. Usually it seemed to be mostly the line and the lack of a run game getting Rodgers beat up. This year, more than others, it seems to be issues with the WR group.
Then there was 2011, where they surged out of the gate and started petering out by the end of the year. In 2013, Rodgers was injured and they re-routed their offense through Lacy.
Assuming they overcome their problems through re-jiggering or personnel (Abby/Monty), they probably are due for a bounce during the last quarter of the season. M3 has made references before to how he builds his strategy throughout the season so they are peaking going into the playoffs. We'll see if that holds out here.