Is Communism efficient in real-world application?

I truly believe that if you are to argue about Communism, you should argue about it's real-world applications, since it appears perfect on paper. According to Answers.com, Communism is "a system of government in which the state plans and controls the economy and a single, often authoritarian party holds power, claiming to make progress toward a higher social order in which all goods are equally shared by the people." Doesn't it sound pretty good? Material goods being shared equally by the popula...