I think that this is fair. There are levels to the previous QBs:
Average/Decent NFL starters: Flutie, Tyrod & Fitz
Decent but scared: Orton
8 good games played: Bledsoe
Some talent that very rarely made a difference: Losman, Rob Johnson, EJ
Below average game manager: Holcomb, Thad Lewis, Barkley
Scared to play: Edwards
not worth discussing: Anderson, Kolb, Collins, AVP, Brohm, Tuel, Cassel,
Worst player in franchise history: Peterman