☭ 𝗖 𝗔 𝗧 ☭East Germany wasn't horrible specifically because it was Marxist-Leninist. That's an oversimplification of the country and its dynamics. From what I know of the country, one of the main reason why the country was suffering was a combination of poor leadership and management from the people running the state and sabotage from the West in the form of sanctions and trade barriers, and the Western sabotage is something that the other countries you mentioned also suffered from.
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