Peyton Manning knows football. Indianapolis Colts fans all know this. He led Indy to a Super Bowl and the division crown eight times. He might have later played for the Denver Broncos, but in Colts fans' hearts, he will always belong to Indianapolis first.
Still, while he had good raw skill, if not elite athleticism, one of the reasons he was so successful was that he was an elite observer of the sport. He read defenses easily and knew how to adjust as needed. Even when his arm strength deteriorated later in his career, he put his teams in a position to win.