Obviously the evolution of the game has changed it. When Ronaldinho was at his peak I heard a lot of people say that he was better than Pelé. Of course comparing players across a 50 year time period is not great, because everything has evolved to be quicker, more skillful, more physically demanding. Transplant Lev Yashin into the modern game from his era and he'd probably struggle. But have him as a young player growing in the modern game and who's to say he wouldn't be the best in the world?
Goalkeeping then was still very difficult, the ball was like a rock, gloves were not very advanced, and they had virtually no protection.