i honestly think there are only like 3 tiers. in the first tier are 2 or maybe 4 people. these guys are often considered for playing with weak defenses and/or weak supporting casts and still pull out wins on a consistent basis.
brady, manning, brees in that order
then there are 10+ good players who just dont have that luxury of a good supporting cast and dont have that all-world ability to make the team by himself. or they have good supporting casts and look like pro-bowlers.
newton, schaub, vick, rivers, romo, dalton, eli, flacco and others in no particular order
the last tier are 10+ people who more often than not have mediocre to bad supporting casts so its very hard to judge them but they surely werent flashing anything over the last years
cassel, fitzpatrick, gabbert, skelton and others in no particular order
also i cant stand people who use super bowl rings for an individual pedigree argument. obviously, if there is a position where it could work, its QB, but i think its horseshit even there.