Communism, especially Marxist-Leninism, seems to require some sort of benevolent dictator who is willing to work towards destroying their own power, which obviously never seems to happen. ML theories state the need for a Vanguard state, which is a dictatorship that is supposed to be there to simply enforce the rule of the working class until a time when it is no longer needed.
So the idea of dictatorship is built into the major form of communism that has been tried, basically. One of the main problems with this is that the steps a nation has to take before it gets to “true communism” in ML theory are ripe for abuse, and hard to get through without someone corrupt seizing power.
I think there are some good theories in Marx writings, it’s just the methods for attempting to implement it definitely need to be reexamined because they don’t work.