A lot of good points made in this thread, and mostly the criticism is deserved. The offense was off kilter all game, but substantially more skittish in the second half. The Bills have what appears to be a legitimate defense, although I would hold fire on elevating them to top 5 for a while. They were at home, the Bills support was hyper enthusiastic, loud and consistent, and they benefitted from the early mistakes of the refs. And then.....they were facing a vulnerable offense with limited weapons and limited protection. I will wait for the all22 view, but the OL looked porous, with insufficient (if any) blocking from TE's and WRs, and rare visibility from Develin's replacement. It was obvious that Edelman and Burkhead were limited in both snaps and duties beyond decoys, and Michel did well considering the limitations of the blocking in front of him. That left a not-fully-trusted rookie, a ghost of a TE and two WRs to cover. Guess what? All the Bills' defense had to do was double Gordon and Dorsett, and take advantage of the Patriots' frail OL. Hats off to them that they succeeded, but they are not unassailable. It is unlikely that they will prosper as well when they visit Foxboro.
The defense was pretty good, although the number of turnovers was flattering. Those were pretty bad throws by Allen, and yet he kept going back to try them again. Others have pointed out JC's obvious mistake, but even then the D gave up more yardage than they should (ground and air) to a pretty weak Bill's offense. However I do think that this was the game plan, knowing that mistakes were inevitable, and allowing the opposition to believe that they were succeeding against the league's number 1 defense. So while the interceptions were expected, credit does go to executing the kill, especially JC who could have been MVP but for the bump.
The end of the game came with a long sigh of relief. Yes it was an ugly win, but we have a defense that can capitalize swiftly and surely against any opposition's mistakes. FedEx Field will be nowhere near as hostile as Orchard Park.