Pro Football Focus has graded every game in the NFL dating all the way back to the 2006 season, providing almost 20 years of data on every team, including the Green Bay Packers. At PFF, an "elite" grade for a season is anything 90.0 or better, and the Packers have enjoyed several elite or near elite seasons by players on defense over the past 20 seasons.
Unlike the offensive side, where the majority of the elite seasons came from only a handful of players, the Packers defense has a smattering of players who have been elite during recent seasons.