5. Ken Stabler (underrated)
It’s hard to imagine that a quarterback who won a Super Bowl and is in the Hall of Fame could be considered underrated but here we are with The Snake. In his very first season, Stabler led the league in completion percentage.
From there he would go on to one of the greatest careers in NFL history. At the time of his retirement, Stabler finished with the second-highest completion percentage of all-time. Yet that was his only major league-wide standout statistical category. The guy won a league MVP twice but didn’t put up massive numbers. That’s why it took so long for him to get inducted into the Hall of Fame.