CalamityX11
49ersDevilsYanksNets
I haven't looked up stats or anything, but the Cards and Packers are what come to mind. I think they both had middling defenses but had offenses get hot in the playoffs. One made it to the SB, the other got the ring. Maybe I'm wrong, though, and maybe their D's were better. I'm being lazy and not doing the research tonight.
I don't know if AZ's defense was above good, i think fair and/or average? opportunistic and def aggressive personnel.
But in addition to GBs offensive force, their D was very good in pass rush and in the secondary... a very complete team IMO.