I don't think the intent was to say thet the GF movies are representative of American life but they are, quite clearly, a cultural element of American life the way John Wayne is a cultural element of American life.
Just a part, a bit of the flavor, a cultural reference that most people understand.
I am sure you are right. I just simply can't stand the way mafia movies are held in such high esteem. They stand for a way of life that is to be reviled not revered as so many seem to do.