My favorite Marxist leader of all time was Dubcek, the leader of Communist Czechoslovakia. He initiated the Prague Spring, which was the best thing to happen to Soviet style socialism, and actually managed to maintain a socialist state where people are allowed to voice their concerns and say a say in what goes on in their government. Dubcek completely ended state censorship of literature and released thousands of political prisoners. He called it "socialism with a human face." Unfortunately, the Soviet bureaucrats couldn't deal with any sort of democracy and sent in their tanks to crush the Prague Spring and revert the country back to an oppressive dictatorship. Dubcek later became a democratic socialist and was the elected president of Slovakia.
I also like Tito alot, he managed to be independent of the soviet union and allow to reletive amount of freedom to his people. Fidel Castro was also pretty cool - he does imprison desenters, but many less then alot of American allies, and he's actually kept his revolution alive and didn't corrupt it like China.
People like Dubcek are good examples about how Marxism is actually a humanistic ideology, and nutbals like Stalin, Mao and WHeelchair man should be able to give it a bad name.