I suppose 2011 has to be there, no?

1983 was a fun year, but with lots of peaks and valleys if I remember correctly. Real clunkers against Tampa, Detroit, and someone else.

But '83 is borderline for millennial living memory. Based on that clue alone, I would look further. 1996 is the obvious place to look but the offense really wasn't consistently great that year, there were too many bad games after Brooks and Freeman got hurt. Now the '96 defense might make an ATG list.

The other answer that comes to mind is '89. It doesn't qualify as statistically great by any stretch, but Majkowski engineered lots of comebacks and excitement. So assuming this list isn't based on numbers alone, I would go with '89 and '11.