By HarperCons's definition, there has never been a communist country, so he can't show you a successful one.
There has never been a country where the workers owned the means of production. They have always been owned by the bosses or the state (another set of bosses).
The only places where the workers are even able to own the means of production are, ironically, the big, bad, EEE-vil capitalist countries, where co-ops, partnerships, and worker ownership of stock are relatively common. (though admittedly not a large part of the economy).