No, there is a clear political goal in Marxism. It isn't scientific analysis for the sake of scientific analysis. It's virtually impossible to read anything Marx wrote and not come out of it completely sympathetic towards the plight of the working class and view the ruling class with complete contempt. "From each according to his own abilities to each according to his needs" is a very clear moral prescription. He wasn't describing how people living in a bygone communal society behaved but prescribing what people living in a communist society ought to behave. Forget about being a good comrade, you'll go far towards being a good person if you start applying this moral principle to your life and cultivating this moral principle towards other people in your life.