As much as I think Brady is the greatest QB ever and should be number 1, I really can't fault those that think Rodgers is number 1. 10 years in the NFL and a lifetime passer rating of 106.0. That's better then Manning, Brady, Montana. As a pure passer Rodgers is probably the best ever but he doesn't have the post season success that Brady and Montana had. The debate should be is Rodgers better then Peyton Manning.
Manning is a great pocket passer but Rodgers can do it from the pocket or on the run.