Joe Montana's entire legacy is built on 4-0 in the Super Bowl. There is a myth of his herculean post season performances as a result. Because he went 4-0, nobody remembers the three year stretch of garbo from 85-87 (smack dab in the prime years of the stars of that team) where the 49ers couldnt win a playoff game.
85 vs Giants: 26/47, 0 TD's, 1 INT, 65.6 QB rating
86 vs Giants: 8/15, 0 TD's, 2 INT, 35.2 QB rating, Jim Burt hit him so hard people thought he was dead
87 vs Vikings: 12/26, 0 TD's, 1 INT, 42.0 QB rating
And let's not forget the last high profile stinker of "Joe Cool's" career, the AFC Championship game loss to the Bills in '93: 9/23, 105 yards, 1 INT.
'Joe Cool' wasn't so cool when those great Giants teams of the era were smacking him in the mouth and knocking him out of the playoffs three times.
And then we have this...
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Lewis Billups dropped this Montana pass, which hit him directly in the chest. James Harrison caught Warner's pass, which hit him directly in the chest. Both players threw awful passes.
The point? If Montana is 3-1 instead of the mythical 4-0, we perceive him in a different way, we focus on the Billups INT, the bad, bad losses to the Giants,
etc. But because he's 4-0, nobody cares or remembers how bad he was in spots. He's Joe Cool!