They'd have been playing different roles with a much better pass rush. We had big problems when our front seven didn't generate consistent pressure. Without looking I'd guess we gave up less than 20 points in about a half a dozen games. We did have some successful defensive games.
6 is the number. Here they are. In parentheses are their season averages.
14 in a loss @ the Vikings (20.4)
16 in a win Vs. the Giants (19.4)
10 in a win Vs. the Bears (17.4)
13 in a win @ the Eagles (22.9)
13 in a win Vs. the Texans (17.4)
10 in a win Vs. the Seahawks (22.1)
However, you have to balance that with the reality that they gave up 30 or more on 5 occasions.
30 in a loss Vs. the Cowboys (26.3)
33 in a loss @ the Falcons (33.8)
31 in a loss Vs. the Colts (25.7)
47 in a loss @ the Titans (23.8)
42 in a loss @ the Redkins (24.8)
Not surprisingly, those were the 5 best scoring offenses that the Packers played during the regular season. The bottom six were six of the seven worst scoring offense that the Packers player (Detroit is the other one). One NFL season doesn't provide a very large data set, but these numbers would seem to indicate that the Packers' defense is capable of bullying a lousy defense, but will turn around and get shredded by a good one. There isn't much in between.
The problem is that, most of the time, the offenses you run into in the playoffs are the good ones. The Packers avoided that in the WC round with the Giants, who they bullied to the tune of 13 points. But they surrended 31 to Dallas in a win, and 44 to Atlanta in a loss.
This is all pointing to what we already know-- they have to get better if they're going to get past these elite offenses in the NFC and get to the Super Bowl.