Really Andy? IIRC that 2011 D needed the Saints D to have an utter collapse in the last game or THAT Pat's D would have been the worst ever in yards allowed. Instead the Saints D have that "honor" by less than 100 yds. So yest Andy that D was close to being historically bad.
That being said, like most Pat's defenses their scoring D was much better than the total D. IIRC around 18th that year, and like Atlanta's D, they were improving over the last third of the season. Improving to the point where, I have said many times, the Defense was NOT the reason we lost that Superbowl, holding the Giants to 13 pts until that final drive
And THAT being said, I have never said this was a good Atlanta Defense and I believe there are many "experts" who are wildly overrating it because they did so well against an WOEFUL OL and banged up D of the Seahawks, and a truly horrible Packer D that employed a really bad defensive game plan, and also had a couple of OLmen go out of that game. Plus they never had to play from behind in both those games.
If fact to a lesser degree, the Atlanta D reminds me of the Pats 2011 D. So it is possible that they can do as well as the 2011 D did in the superbowl, but I would be surprise if the Pats don't get more than 30 tomorrow.