It's as evergreen a sports talk topic as there is, in large part because there's no completely objective way to rank QBs throughout history. Any claim of "best ever" is automatically biased.
I can explain my reasoning if you like. Just know going in that I'm a history nerd who normally sits out pop culture trends. Just not this time. The top five:
1. Johnny Unitas
2. Joe Montana
3. Otto Graham
4. Bart Starr
5. Tom Brady
Your thoughts?