I never said I disagreed with Marx's critique! However, I would note that goal and result are not necessarily the same.
I would say Marx succeeded in producing a lot of interesting practical results which could actually be implemented. On the other hand, some of his stuff smacks more of religion than it does of praxis. His "law of value," for example, seems very unfalsifiable, in a sense. He speaks of the approach to true value when supply and demand equilibriate, but his conditions of equilibrium are often either poorly defined or simply tautological (e.g., the true value of a good is when it meshes with the law of value, thus the law of value is the true value of commodities).
Indeed, many of Marx's ideas have been through the crucible. Some, like a command economy, have mostly been burned to disintegration. Others, like the provision of health care to anyone who needs it, financed by the people according to their ability, seems to have had huge success among most of the civilized world.
All in all, I don't have problems with Marx's approach, just the idea that rehashing ideas from a century ago in pretty much identical ways counts as innovation.
From the end of his Theses on Feuerbach: "Philosophers have hitherto only interpreted the world in various ways; the point is to change it".