13 to 20 are average range. Since there are 32 quarterbacks, 16 and 17 are the most averaged ranked quarterbacks in the NFL. This tier should have the most quarterbacks in it. These guys at the very least should be able to manage a game. While the group below them needs a supporting cast, this group is a little more capable.
From 21 to 26 are below average quarterbacks. These guys need a supporting cast and are the but can still manage a game. These are typically the bridge quarterbacks. Although teams would prefer to get their bridge from the a tier higher.
From 27 to 32, these are guys that are bad. Typically they are either in development or should be backups. There maybe the guy who has fallen victim to circumstances here but for the most part, if your quarterback is here, it's most likely time to start shopping for either a quarterback or a lot of supporting offensive talent.
From ranks 7 through 12, these are the above average to good quarterbacks. They are guys a team can win with that should be able to allow a team to win because of. They might not be able to do it every game but there should be about a 50% chance that they could be trusted to carry the team if needed.
From ranks 1 through 6, these are the good to elite quarterbacks. They can carry a team when need be. They elevate those around them. They are the field generals. And the no questions asked franchise quarterbacks. I listed this group last because it's the most talked about.
We need to stop acting like those ranked 17 and on are all bad quarterbacks. It's unrealistic and it puts too much expectations on the players. Having a clear tier rank for average players allows for more accurate rankings of the good and the bad quarterbacks. People need to stop expecting every quarterback to be Aaron Rodgers, Tom Brady, Patrick Mahomes, or Lamar Jackson.