The Patriots surrendered 17 points during the Super Bowl, which was 0.1 points fewer than it allowed per game during the regular season. That 17 ppg number was the 4th best scoring defense in the league. The Giants season offensive scoring average was 23.3 ppg. In other words, the Patriots held the Giants scoring offense to 6.3 points fewer than its season average.
The Patriots offense scored only 14 points in the Super Bowl. The offense averaged 36.8 ppg during the regular season. New England had not scored fewer than 20 points in a game all season long. The Giants allowed an average of 21.9 ppg during the season. In other words, the Patriots offense was held to 22.8 points fewer than its season average and 7.9 points fewer than the Giants season defensive scoring average. As I pointed out before, prior to this season, no team had lost the Super Bowl while allowing fewer than 20 points since 1975. Had the Patriots offense simply matched its season low for points scored in a game, that streak would have continued.
Now, let's take a look at the scores of the losing teams in the Super Bowl, from this season back to 1975:
14,17,10,21,29,21,17,7,16,19,24,21,17,26,13,17,24,19,10,10,16,10,20,10,16,9,17,21,10,19,31,10,14,17,6
What do those numbers show? They show that, even in losing efforts, teams scored 17 points or more in 19 of the 33 Super Bowls since 1975 (just as an FYI, If you drop the number to 16, it makes it 22 of 33 Super Bowls in that span, or 2/3 of the games). Or, to put it another way, 52 out of the 66 teams to play in the Super Bowl since 1975 have scored 17 points or more during the game.
Your argument simply does not stand under scrutiny. The loss falls squarely on the offense, and particularly on the offensive line.