I think there is a certain tendency among modern analysts to both minimize the accomplishments of the past and to underrated champions. The first is understandable. Football changes from era to era unlike almost any other sport, and the game as it was played in the 1960s bears only a passing resemblance to the game today.
The second is the result of a modern skepticism born of a mistrust of quarterbacks like Eli Manning and, going back a bit, Terry Bradshaw. That skepticism is warranted as many commentators still focus on “ringz,” but it’s worth keeping in mind the Montanas among the (Eli) Mannings.