On the other hand, the playoffs and Super Bowl are the highest pressure games for any team and any QB, and the QB is generally considered the most important player on any football team, with the greatest ability to affect the outcome.
And therein lies the problem. This stems from media and fans that truly don't understand football. A great example is Trent Dilfer. He has a Super Bowl ring and he was absolute
awful. But that Baltimore Ravens defense was legendary and defense wins championships. Just look at the list of Super Bowl winning QB's throughout history:
Doug Williams (Washington Redskins)
Mark Rypien (Washington Redskins)
Jim McMahon (Chicago Bears)
Phil Sims (NY Giants)
Jeff Rutledge (NY Giants)
Brad Johnson (Tampa Bay)
Trent Dilfer (Baltimore)
That is a pretty pitiful list of QB's (and that's just off the top of my head). Meanwhile - look at the guys who never won a ring. Dan Marino. Dan Fouts. Jim Kelly. Frank Tarkenton. Warren Moon. All Hall of Famers. But they didn't have the TEAM around them.
I would not call that list pitiful. Far from great, but not pitiful. Dilfer was no better than average, same with Rypien. Johnson actually had a very good year when the Bucs won the SB (22 TDs to 6 INTs), although the defense was still the driving force behind that team's success. Williams wasn't a bad QB, but he played on some horrendous Bucs teams. Simms was perhaps a bit better than average. When did Rutledge start a Super Bowl? He was a backup. You're thinking of Hostetler, who certainly isn't on any lists for the best quarterback, but did play pretty well in very limited playoff opportunities (His teams went 4-1, he threw 7 TDs and 0 INTs, he had a 62.6% completion percentage and 112 QB rating).
As sealy pointed out, however, you are looking at 1 time winners. The list of multiple time winners is : Bart Starr, Jim Plunkett, Eli Manning, Ben Roethlisberger, Bob Griese, Roger Staubach, Peyton Manning, John Elway, Troy Aikman, Terry Bradshaw, Joe Montana, and Tom Brady. That's a pretty good list of quarterbacks. Eli Manning and Griese haven't been great, but the rest are at least good if not great quarterbacks. And Manning played extremely well in the playoffs during both of those Giants Super Bowl runs.
It's unfortunate Marino never won a SB. If he had, he might be higher on more all-time lists.