What I want to know is what exactly people think Brady's weaknesses are. He doesn't have the strongest arm in the league, but as his TD to Branch showed, he can put the deep ball on the money. He's not mobile, but he can move around well in the pocket. And of course, the short- to medium-range passing game is his forte.
So what exactly are people basing it on when they say he wouldn't succeed in a different system? Maybe he wouldn't, and I'm overlooking something, but I wish there were a better argument than "Brady sucks. Look how much better Manning's stats are!"