My only known problem with Marx is centralism.

There is a paradox about Marxism. Its goals are similar to anarchism: a classless, cooperative, society, self-managed by the freely associated producers, with the replacement of alienated labor by craft-like creativity, and the replacement of the state by the democratic self-organization of the people. Yet in practice Marxism has resulted in the Social Democratic support of Western imperialism and in the creation of “Communist” totalitarian state capitalisms. Why is this?

https://theanarchistlibrary.org/library/wayne-price-decentralism-centralism-marxism-and-anarchism