I think the days are long gone for when juggernaut teams just destroy everyone right from Week 1 in the NFL and ride that wave all season long - and a big part of that is how the game is played and 17 weeks of the season.
Now it's about how you are playing in December and health - theres a blob of about 10 teams that could either peak at the right time or wind up 10-7 and get bounced in the 1st playoff round. I'd say the Packers are in the upper echelon of that blob and have plenty of room for improvement. They could also fall on their face instead of improve, too.
I dont like anyone's odds beating the Lions at Ford field in the playoffs - but I'd say the same thing about the Packers, Tampa, San Fran, or a focused Philly team at home in January right now, too.