Marino had plenty of natural talent. Won’t argue that. But he was also selfish, carrying more about personal stats than the success of the team. He is certainly not the only player like that, Randy Moss was one of the greatest players of all time, but selfish, he broke Jerry Rices single td record, but never got a ring out it.
There you go. If you could put together the greatest NFL team of all time using only players who don't have a Super Bowl ring, Marino would be my QB and Moss would be one of my WR.