Subjectively, it seems like Brady in the last couple years has started to struggle with stretches of inaccuracy, and that he’s taking more hits than in past seasons. Our stats seem to disagree. As you can see from the numbers above, Brady has been an efficient machine, even better than his standard numbers would indicate because the Patriots keep playing harder-than-average defensive schedules. The difference in his DVOA between plays with pressure and plays without is roughly equal to the league average. Between hits and sacks, he was knocked down on just 10.4 percent of pass plays, the fifth lowest rate in the league. And Brady’s completion rate would be even better if Patriots receivers didn’t drop 6.5 percent of passes (fifth highest in the league). At age 36, and with so much of his receiving corps turning over, you can expect a little bit of decline, but not much.
Football Outsiders 2013 Almanac