Another problem with communism was the bolsheviks.
(I truly believe we would have seen a different kind of communism had the Mensheviks prevailed over the bolsheviks,since their enitre attitude towards it was different (let's take things slowly & convince the people that our ideas might be right instead of forcing them upon a large majority of the people at gunpoint, which is essentially what the bolsheviks did...)
http://en.wikipedia.org/wiki/Menshevik
Most other communist countries were heavily influenced by Russia, even China (although it did manage to develop a semi-independent system, it's basis was still Russian).