Patriots SB victory margins (best recollection):
3
3
4
4
6 (OT)
Notice any that were not competitive?
Assuming your post isn't sarcasm then you are conspicuously wrong. Every game from here on is competition including the Titans(who just completed a pretty damn good comeback on a pretty good D). And almost certainly the competition will get more difficult with each game.
If the Patriots (From Brady to the OL to the DL to the secondary) don't show up playing among their best possible football? They are vulnerable to any playoff competition not named the Bills. And from what I've seen the Patriots playing among their best football is by no means guaranteed. Through the last game, the Jets, the Patriots simply were not putting together 4 solid quarters of good execution (recall they pulled out the #1 seed/win against Pitt by a fraction of the skin of their teeth). What Patriots have you been watching that you think there is no real compeition?
The good news is if the Patriots can play among their best on both sides of the ball I like their chances over any team. And even if they don't play among their best they are experienced and savvy enough to still find a way to give themselves a decent chance to win. But every game (Titans, then Jags/Steelers, then Phi/Minn/ATL/??) is likely to be a tooth and nail fight where the Patriots will battle ups and downs but pull out the win (whoa to us if the OL struggles). Yes, I'd expect the Titans game to be sloping downhill earlier 4th quarter while the other two games I'd expect later in the 4th quarter there will be D stops and/or O drives needed to seal the victory or even get the victory.