Anarcho-communism is a good idea, but Marxism really isn't. Marx was on the right track, but he made a terrible mistake in advocating a dictatorship of the proletariat. It didn't help that Stalin and to a lesser extent Lenin were quite corrupt and ruined the revolution rather quickly, either. That more or less killed socialism, but then Mao had to make the situation even worse with some spectacular incompetence, like his Cultural Revolution.
The problem with communism isn't that it itself is flawed, but that the most widely used pathway, Marxism, is flawed. Communism itself would work if it were done through anarchist means, organized from the bottom up by willing participants. It is unlikely now for people to attempt it as the capitalists have every advantage.
"Human nature will not allow true communism to prevail because the Theory (and that's all Communism is)provides no basis for human initiative or individual progress and/or responsibility. Some call it 'greed'."
You should read more about communism, particularly anarcho-communism. Alexander Berkman and Peter Kropotkin wrote books about it and explained how the economics would work and the incentive to work would be. Modern anarchists (who are mostly also communist) generally argue that work in the conventional sense can be abolished or greatly minimized.