I'd make a comment here, but I don't want to come off like I hate the Colts (because I don't).
Yeah, I didn't wanna make it seem like I don't appreciate Payton Manning. Certainly one of the best, but I saw Marino play. I saw Montana, Elway, Aikman, Young, and honestly, he certainly belongs in the conversation, but the people who make it seem like it's a no brainer that he's the greatest of all time just drive me nuts.
I think Payton is up there, top 5, maybe behind Montana and even with Brady (Brady deserves some credit for his rings at least), but to call it clear cut based on his stats... I don't buy that. Marino and Favre's numbers are far more impressive when in context of era.
Eddie Epstein did a book called "Dominance: The Best Seasons of Pro Football's Greatest Teams", which is an outstanding book, and he makes the argument that, based on the era they played in, Johnny Unitas is the greatest of all time, and he makes a good argument.
Johnny Unitas' 1959 season is amazing. 193/367 (52.5%), 2,899 yards (7.89 ypa), 32 touchdowns, 14 interceptions for a rating of 92.0.
92.0 Quarterback Rating is absolutely ridiculous for that time period. The League-Wide QBR for that year was 66.1.
From 1956-1965, Unitas' passer rating was more than 20% better than the league as well as more than a standard deviation above the league average.
For the record, in a 294 team-season study, passer rating correlated to winning more than any other QB statistic.
Correlation with Winner Percentage
Passer rating- .62
Yards per pass attempt- .56
Touchdown Percentage- .52
Completion Percentage- .47
Interception Percentage- -.36
Sack per pass attempt- -.36
All of this to say: The rules of the modern era skew our view of QBs and the numbers they put up. Manning's good, but I don't think you can look at his numbers and say "Greatest of All Time" when we're in an era that favors the pass so greatly.