What you described is pretty much the history of the recent NE revival. Their defense has been good enough to limit TD's, gives up a ton of yardage, and forces teams to FG goal attempts. In recent years, they have made mediocre QBs look like HOFers in stretches. But they have also have had teams make stupid mistakes (on the field, coaching, play calling, time management, penalties, you know the drill). A lot of the time you could look at the personnel between NE and their opponents and look at the stats and conclude NE should probably lose. And that analysis would likely have been pretty spot on. Yet they still won. If ever there were a column for INTANGIBLES, it's New England. And it should get a pretty heavy weight, because so much falls in that category that clearly that has made a difference in games over and over again.
Where this game may be different is the Eagles are an excellent red zone team. As has been said a million times, you can't settle for FG attempts against the Pats, and this game will be no different.