FPI's rating is based on the average number of points by which team would beat an average NFL (or college) team on a neutral field. The model uses a Bayesian framework, using priors around the EPA rate of each team unit, derived from preseason expectations.
I look at it this way, from a stats and numbers sense, as we all know from our eyes (well some of us anyways), we are a really good freaking team. How much do you tweak vs. Add and subtract.
I find it interesting to see from a statistical standpoint how we rank up against the rest of the league.
While 1 team may have the Lombardi, still doesn't necessarily equate to the best team in the league, the best team doesn't always win on any given Sunday...