In my opinion, John Wayne is /was the greatest movie star of all time. In terms of personality, box office, longevity and public adoration he may never be topped though Harrison Ford and a couple of other moderns may come close.
Another legendary western star, Lee Marvin, talked about working with Wayne and John Ford in this excerpt from an interview with John Gallagher who really knows his stuff. This was recorded a year before Marvin's death... what a great star he was and he kept his rugged good looks to the end it appears.
Lee Marvin makes a great point on film acting and what an insightful director Ford was.