Guess I'm just not politically, or artistically, correct.
Great art is never about ideas. Duchamp did some very interesting things. Extremely. And pointed to many new directions. But is he a great artist? Not in my book. Once you get the concept, you don't have to look at the art anymore. Visual art is supposed to be visual, or do I have that wrong?
Being from Philadelphia (the museum there has, I believe, the largest Duchamp holdings in the world and has many of his most important and influential works) I have spent many an hour looking at them. So it is not as if I never heard of the guy or am not more than a bit familiar with his work and that of many of those who have followed in the various paths that opened up to them as a result of his work.
Duchamp's art is interesting and thought provoking, surely. But is it great art? Nah.