I went back and looked at the opening day roster of QBs. The only ones that I would have expected to be considered starter for the entire year that have been worse than Bryce are McCarthey, Ward, Fields, Penix, Tua, and Kyler. McCarthey was basically a rookie, Ward is a rookie, Penix had only started 3 games in his NFL career. Fields, Tua and Murrey were the only 3 with as much experience as Bryce. Maybe some would argue TLaw but I think he's had a better overall season still.
Of the slated temporary starters, Wilson, Rattler, Flacco, D. Jones, Jones obviously took the job and ran with it, while the other 3 got replaced for their rookie draft picks.
When it comes down to it, there really hasn't been many QBs Bryce has outperformed that were slated to be year long starters with the same level of experience.