3. Otto Graham (underrated)
It’s easy to overlook the greatness of Otto Graham because he was great so very long ago. In fact, his career started before Bill Belichick was born. After fighting in World War II (told you it was a long time ago) Graham joined the newly formed Cleveland Browns of the AAFC. Over the next nine years, Graham would dominate the league and the NFL once the team switched leagues.
Graham is a 7-time league champion and 5-time league MVP. It’s almost not worth looking at statistics as the game has changed so much since those days, yet remarkably Graham still holds the NFL record for yards gained per pass attempt and for the highest career winning percentage for an NFL quarterback.