I'm suspicious that Brady had been a huge beneficiary of Spygate in the past, along with spectacular offensive lines, and generally good coaching (which instills a "no mercy" attitude and tries to find edges where other teams don't). He's also been able to beat up on an inferior AFC (particularly AFC East) for over a decade now, and thus has managed to be part of the best team out of that group.

That's not to say he's not one of the best of all time. He generally manages to play his game under most circumstances, and with his skill and the weapons he has, that's good enough. However, if he's hit in any way, he starts to unravel. I'm shocked that Seattle didn't try to put hits on him after his second interception.