Not many. I'd say maybe 4-5. Maybe. And I'm assuming by "better" you're not only meaning "less picks," right? I'd say probably a couple more than that, but otherwise, that's it. Some of the guys who had better years, like Brett Favre, would have been disastrous. I'm guessing Manning, Brady, Brees (although that's no guarantee given the vast difference in situations), Rivers, Roethlisberger, maybe McNabb. But look at the list of the most prolific QB's last season, it's dominated by dome and nice weather teams, and every single one of them had a vastly superior collection of skill position players and/or offensive line. There's only three guys in the top ten of ratings who had to play in challenging conditions, and all three of them had weapons that mop the floor of the Bears.