I personally think communism especially Marxism sounds really good on paper. The problem is that just about every time it has been attempted things didn’t really seem to work like they are supposed to.
Its like every state that attempts communism just ends up being a perpetual Vanguard state, and it ends up being authoritarian and terrible.
I really think there are several good ideas in Marx theories, but the actual implementation of those theories needs some work to figure out how they should be incorporated without being corrupted and overtaken by tyrants.