#7 for Namath is nutty, but uh you can't just compare stats from the NFL's Dead Ball Era to the passing numbers today. For his era he was a good player, even if he got way overhyped because of the guarantee.
His # of Top 10 seasons by stat:
Completions: 7
Attempts: 7
Yards: 8
Touchdowns: 8
Passer rating: 5
Yards/attempt: 7
Yards/completion: 8
Adjusted yards/attempt: 6
Completion %: 5
Comebacks: 6
Game winning drives 6
Total offense: 8
Until the end of his career when he was totally busted, his interception % was either league average or a bit better while everything else was in the top 5-10. Heck, he had 5 seasons in the top 10 LEAST intercepted QBs by % of throws.