Burt Lancaster was sort of a "one-note" actor, but no more so than John Wayne. The man made about 100 movies and played the same guy about 90 times.
Both were more "movie stars" than "great actors" to me.
Lancaster was a much better actor than The Duke, IMHO. Sure, in his youth he excelled as the tough, athletic leading man. But look at his later career, starting even as early as 1958 with the Sweel Smell of Success or 1963's Elmer Gantry. There are entries like The Leopard, Judgment at Nuremberg, The Birdman of Alcatraz, Seven Days in May, Local Hero and Atlantic City.
Those are the performances of a Great Actor by any definition.