This is definitely one of those unresolvable sports arguments. I just see certain people who have that winning edge. Guys like Tiger Woods, Pete Sampras, Montana, etc. They are clutch when it counts the most no matter what. They rarely make mistakes in big moments. They perform with injury. If they are down they still know they are going to win and on and on. That's what I would look for in a QB, since they are essentially the team leader. Did Montana have a great supporting cast? Of course, but he was able to lead that cast and do what it took when it mattered. Guys like Marino are great and have out of this world ability. To keep using him as the example, the Dolphins were good enough as a team to make the playoffs consistently (and the SB) with Marino. You can't say that making the playoffs is all Marino, but when they lose in the playoffs it's because he doesn't have the supporting cast. Bad teams don't consistently make the playoffs. Also, I don't think it's fair to say that with a certain cast Marino would have definitely won. That's a total unknown. Roethelisberger proved that he can lead a team in the final minutes of a SB to win. Marino never did that. Could he have done that? Who knows? Tony Rice proved that he can lead a team to an undefeated season. Again, it's a round and around discussion depending on your viewpoint, I think. But it's fun anyways.