I don't know how Rodgers having the worst game ever in his career isn't being manhandled. You say they got away from the run and relied on Rodgers. While that's true, we still dominated Rodgers. That just doesn't happen often.
The Schwartz defense was lights out for the second half of the season, barring the Oakland game (which, admittedly, was terrible). Yes, they beat up on bad teams too. Who cares?
Peyton was dominated. Rodgers was dominated. Brady threw all over them in his first game. Rivers had a good game against them early. That looks like 50-50 to me, not "most of the time."
While the start of the season wasn't great for the defense, they improved the second half of the season. Is it unreasonable to expect the defense that played for the second half of the season to continue playing at that high-level the next year instead of regressing? Denver did.