What you say here is true about the Bills, but it is also true about 70% of the league. It's just what the league wants....parity at its finest.
Take the Colts for example....how can a team that beat Seartle, SF, and Denver get blown out at home by the Rams and also lose to the Dolphins at home? How can the Titans lose at home to the Jags? How does Pitt play horrible all year, give up 55 points and 600 plus yards last week, then play their best game of the year this week?
It's obvious the Bills lack consistency, but I think you can count on one hand the number of teams that have played well on a week to week basis this season.
P.S.: I'm not excusing the Bills for their performance today...it was the most disappointing game they have played by far this year.