Neither did we see any great success emanating from the last eight years of bushism. But you are right, in as much as you appear to equate Marxism with the forms of communism seen in the last 100 years. Of course, not all of that communism has been Marxism. In the same way that bushism does not represent capitalism per se.
You say that Marxism has not been successful but do you know what the aims. short and long term, of Marxism are? We may assume that the ambitions of communists must be spoken in the same language as the aims of non communists. But you know what we say about the word 'assume'.
Left wing movements have almost eliminated the British ruling aristocracy, they got rid of the corruption of the Russian Royal family, they destroyed the corrupt nationalist system of China and eliminated the Batista regime in Cuba.
No one will convince me that the world would be a better place for the continued existence of these crooks.
It is true that no Nirvana stands as evidence of the success of Marxism but certainly in can be said that in many cases the governed population has seen improvements in their lot which would not have been possible under the previous regimes.
You should read Engels' 'The Condition of the Working Classes in England.' It is freely available at Project Gutenberg, and then tell me that left wing politics has never been successful.