Spengler is not the best writer out there. His writing is often hasty, his facts are sometimes dubious (although not as often as some his detractors would have it), and he is not particularly consistent. But he has one merit that outweighs all these sins. His is an original thinker.
That does not make him right, but it does make him an interesting read. His latest essay Americans play Monopoly, Russians chess is no exception. Almost everyone in America from far right conservatives to far left liberals would disagree with his conclusions. But if you are intellectually honest, formulating why he is wrong will require you to rethink your own viewpoint.