I'm not so sure, we held the Packers offense to 15 point at home in their opener (they dropped 40 against the Saints the year before), and put a total beatdown on Stafford and the Lions. This last week I believe was a fluke loss and by no means indicative of how good this defense is, and the Vikings just played their best game possible and had everything seemingly go their way. Last year we gave up huge yardage early in the season to the Cowboys and the Eagles, neither of whom made the playoffs, Vick actually threw for his career best in that game, and the defense tightened up after that. If anything the defense regressed in last week's loss.
As for the red zone thing, the Packers had a very questionable PI call which put them at the 1, and Stafford's TD had another bad call that kept the drive alive. If the defense continues to give up red zone TDs then I'll be worried, until then it's only 3 games. I think it's pretty damn good teams have only been in the red zone 5 times in 3 games against us.
[ Edited by KowboyKiller on Sep 28, 2012 at 7:29 AM ]