Reading Marx (or some explanation of his work from different point of view) is interesting. I think most of his critics do not apply to this world but he do have an interesting point of view and adding some of his ideas into your personal philosophy. I found really good critics of Marx from a rather liberal philosopher. I forgot his name, it was at my college library, but i'm pretty sure that if you are interested in philosophy and in economics theory you should read some of his work.