I believed this was a playoff team (~10-6) before the season started.
I was marginally disappointed in the O-Line run blocking yesterday, but pleasantly surprised by the DBs.
I fully expect them to beat the Pats somewhat handily Sunday. The Pats are not the same team - losing Revis is not a minor thing, and their run D against Steelers backups looked like they miss Wilfork. The middle of the Pats O-Line is a shaky mess and I rationally expect Dareus to go wild on them. Pressure up the middle always beats Brady (and pretty much any other QB).
Sure - I have all that Bills-fan fear from years of disappointment, but rationally, I can see a 9-7 team from last year with a top defense that upgraded at 6 of 11 offensive positions and rationally determine this is a 10-6 or better team that will likely make the playoffs. If they win the next two, with no big injuries and Tyron still playing well I will start thinking about 12-4 and the division and beyond.