In the second half of that game, SF really amped up the pass rush. I don't recall the Giants having had to deal with anything as bad as that all season. That said, the weather was certainly a factor as well.
New England's defense, particularly its line, is nowhere near as good as SF's, so I wouldn't expect to see the Giant's offense harassed nearly as much. I still think it's going to be a close, hard-fought game, though I'm hoping that the Giants can find a way to beat the snot out of New England!!!
It's easy to be against something ... It's hard to be for something!