The D was pretty bad. Sure, they surrendered only 26 points, but they had virtually no pressure on Manning, including no sacks, and forced zero turnovers. Losing Talib hurt, also.
That said, the D at least forced the Broncos into a bunch of field goals, giving the Patriots plenty of opportunities to win this. Yes, they overachieved this season; yes, it was a successful season, especially considering all the injuries; but they still could've won this game today.
Brady was pretty bad. He missed Edelman deep early on a play-action, a little while later missed Collie deep—both guys were wide open. He also missed a wide-open Edelman in the end zone in the fourth. Oh, and he failed to see a 335-pound defensive lineman coming straight at him untouched.