Every time I start to listen and learn from people more left than I am, they get to the part about how after revolution there's probably going to be a period of autocratic rule that should then dissolve by the will of the people. Except none of them talk about plans to actually facilitate the transfer of power, or better yet, prove Lenin wrong by not going thru a period of more authoritarianism.
If anything, communism has been tried, but it's never been achieved. A stateless, classless, currencyless society still sounds frickin awesome... But that's not we've had :(