Woah. I think a few people crazy enough to bet on NY just made a lot of money.
My thoughts as a NFL amateur-watcher:
The level of the game itself throughout wasn't spectacularly high. Both teams were rather solid, giving very little away and generally giving each other a hard time. There were brief moments of serious quality play, however. The second Patriot TD and those two last Manning passes, especially the one where he nearly got taken down and still managed that pass, were excellent.
Patriots started playing way too late. They barely had possesion first half and only when they were 10-7 down with 11 to go did they get their ass in gear.
Giants were solid throughout. Their defense was their strong suit, though they were helped by an inconsistent Patriot offense. I don't know enough about the game to know whether this was Brady's fault or the rest of his offense. My gut says both.
Manning wasn't consistent in the game but had a few brilliant moments that really made a difference.
Imo the Giants won deservedly on team effort and will to win. With the exception of the last 10 minutes, the Patriots never really looked like they'd do anything for that trophy and record win.
In the end it was a real final. Incredibly hyped, some thought it was already played and we'd better save us the trouble and give the trophy to the Patriots right away. In the end it was a hard fought game with relatively poor play, but boy was it exciting.