I thought this before the year and week 1 started to confirm it, but a lot of the top tier teams aren't as good as last year. A lot of the mid tier teams are a little better.
It is going to be an interesting year parity wise, might be some disruption to the status quo we've had in the NFL the last 4-5 years as far as who the good teams are.
GB lost Jordy Nelson, NE lost a host of guys on D, Manning's regression looks very real, Indy didn't really improve, Seattle lost some guys and is probably fighting some fatigue from all the football they've played the last few years, Baltimore I think just has problems offensively, etc
Then you've got teams like KC, Buffalo, Miami, SD that are going to be a little better.