Packers have been proving for a while that its entirely possible to be good with a HoF QB and a shit Defense, especially if most of the weakness is concentrated in the line and not the secondary. Outside of White, none of the 90s era defensive players were anything memorable and Rodgers SB run was done with the lowest paid/youngest defensive roster in the league. The wheels come off when anyone stalls you, though, which is why even the Packers are starting to invest more in the trenches lately. You also get completely fucked if your QB gets hurt (see Packers this Sunday) to any degree.
But just look at Detroit. They had arguably the strongest D Line in football (and the stats to back it up) this season and even the Curse of Romo was not enough to give them a playoff win. Outside of Seattle and perhaps the Cheatriots (who are stronger in the secondary), most of the best defenses are watching next weekend's games on TV. In fact, outside of Seattle, none of the remaining teams are even in the top ten for total defense and that's even with all of them having nearly all divisional opponents with some of the worst offenses in the league.
Now Seattle is the lone exception and I am afraid to say probably the odds on favorite to win it all at this point, but roiding up and pumping miked crowd noise into the opposing bench will make a great defense basically unstoppable. Just ask the late 90s Vikings. For Seattle to actually lose, however, is going to require a QB having the balls to test Sherman and a ref willing to throw the flag when he is dry humping the receiver all the way down the field. Rogers has the accuracy to do it, but I don't think McCarthy will let him. Brady has the will and permission of Coach Vader, but his accuracy drops when pressured and Seattle will throw the kitchen sink at them. I am also fairly confident that the refs are going to be extremely hesitant to call holding or PI for the rest of the post season, given all the Cowboy drama. So Seattle's SB to lose at this point, pretty much.