Except communism has always resulted in a few people ruling and rigging the system in their favor. Just like every other system, only they tend to kill a lot more people to maintain it.
Communism is a classless, stateless society. The Soviet Union was neither the former nor the latter. Yes, the Soviet Union was brutal, but I don't like the Soviet Union, in fact there are many communists that don't (specifically anarchists). Also, you seem to give too much credit to the capitalist systems, they have killed numerous people as well in order to maintain power.