In the Soviet Union and Cuba, you are correct, there was/is a problem with elitism, and the party is absolutely a separate, bureaucratic class that maintains its own interests separately and above that of the proletariat. For that reason I do not believe Russia was a genuine worker’s state. However, Russia and Cuba have something in common, not unlike other Marxist-Leninist states of the past… their recorded wealth inequality/disparity was among the lowest in the world. These states, while often antagonistic to worker’s causes, did still do more for their people than the United States even could today.
Venezuela is complicated today in its leadership but it isn’t Marxist-Leninist, and it isn’t a communist state. North Korea doesn’t have a Marxist-Leninist government but they practice something similar. These are not as successful examples of socialism, but I also don’t think Chavez is completely to blame for Venezuela, as his reforms initially made significant progress in the country. The country was doomed when the price of oil fell. We’ve also made their situation worse with sanctions, and Bush wanted to overthrow Chavez in 2004.
In China, the state owns almost all land. I don’t think they have significant interest in your personal belongings.