Brady has had three rough games this year (Dallas, Philly, Buffalo). He's had another couple average games and a few stellar games to start the season.
If this keeps up, this may be the "worst" year he's had for awhile. If he has another year of this or worse, it could be the age finally working its way in. But people have been predicting the decline of Brady for so many years now, who knows.
The good news for the Patriots has been their defense. If they keep it up, and Brady's floor this season is still an above average QB, they've still got a great shot.
Rodgers is still throwing down pretty efficient stats, but he seems to be making some mistakes you wouldn't expect out of a guy his caliber. He seemed to do the same thing a lot last year. It'll be interesting to see if he bounces back, he just seems off.
Nobody's going to say either of these guys are bad quarterbacks, and if they are on a good team they both have that clutch to get it done.