Hundley's day was statistically solid, but there was one stat that shows the problem; 5.8 ypa, which is about as bad as any quarterback is going to deliver. There was no vertical threat and the deep passes that were attempted were commonly thrown into double-coverage. Combine that a ground game that only produced 3.1 ypc, and early game struggles on 3rd down, and it led to an anemic offense for most of the game. The only quick fix to these problems is the return of Aaron Rodgers.
This quote summed up the current state of the defense:
The Packers’ pass rush was almost non-existent and defensive coordinator Dom Capers couldn’t blitz because of the coverage situation. Trying to win against the Panthers playing that way will be difficult.The run defense got mauled too, but that's a lesser problem behind being unable to rush the passer and cover receivers. They can't do anything too aggressive to try and stop the passing game, instead they just play it pretty much straight with an ineffective 4-man rush and a mix of zone and press coverage (sometimes on the same play) to try and confuse the defense. If it's not confusing or slowing down DeShone Kizer, then I'm not sure who it's going to confuse.
Nothing would have been worse than a loss, but this win showcased all the things they haven't been able to do on offense or defense for most of the season.