What was the historical significance of Operation Market Garden in World War 2?

For one thing it confirmed the growing feeling that unsupported paratropers could not defeat regular troops, particulary armored. They simply could not bring along artillery, tanks and other heavy items that modern armies require. The Germans had concluded this after their successful, but costly invasion of Crete. I think it also had the effect of putting Monty, the tempermental English General, in his place. After this operation he was a little more open to suggestion.