Some number of decades ago I looked at the chess games of Rubenstein, not knowing who he was. I was stunned by the profound beauty of his moves. He was a bit unbalanced mentally. During games he would stand in the corner away from his opponent, then rush to the board to make his move and rush back to the corner. He hallucinated a fly that he said always followed him and spied on him. Diagnosed as schizophrenic, he was hospitalized. But no one has every questioned the deep beauty of his moves. After WWI, the quality of his games declined. At this point in his life, he has been accused of making moves because they were beautiful and not necessarily good. Who knows?
I've read very little Marx, but he does have some delicious and provocative ideas. Did you see my thread on "The End of History"? That was Marx, applying logic after defining the forces at work in history. A thought stimulating conclusion. He has many ideas like this. Today economists know his ideas don't work and know why. Although communism has never been fully implemented it's economic polices have shown themselves to be impractical. Still, his ideas remained seductive. Today these ideas are part of the foundation of the Left. Like Rubensteins' moves, the beauty of Marx's ideas blinds some to their flaws.