I might give the offense a D just because I think we did move the ball OK against a defense that is built to protect leads and knew Cam had to come out slinging for us to have a chance. The above poster is right in that some of Cam's bad decisions weren't when he was under pressure, but he was under pressure so often (because the D-line was just pinning their ears back) that it definitely shook him a bit. That's something that will hopefully get better with experience, but even Tom Brady isn't himself when he plays the giants. Also, I blame Chud for not giving Cam a hand and throwing in some more screen passes/quick drops rather than sticking to slower read-option poo the whole game.
Had the defense not been a complete and utter catastrophe, I actually think our offense would have done pretty well against the Giants.