Having guys like Joe Montana, Tom Brady, Steve Young, Bart Starr and Roger Staubach above him is a stretch?
No, not at all. However, that puts him at 6th not 8th-10th.
It comes down to opinion, really.
Very true.
Seems to me your looking more at best winners all time than best qb's. Peyton has a top 5 career passer rating in history, had the #1 passer rating for a season, has completed the 3rd most passes in a career, has the 3rd highest completion % in a career, 3rd for most season with 3,000+ yards, tied for 2nd with most 400+ yard games in a career, 3rd for most td passes in a career. OK, I'm tired of listing stats.
I guess basically it comes down to the whole Dan Marino thing, if you think of a QB's greatness in reference to superbowls - which you do - Brady is better. If not I think it's clear that Peyton is. I personally, have never understood that methodology because it is only relevant to qb's. No one cares how many rings the best rb's or wr's have. That being said, neither is wrong.
Like you said it's all opinion.