I don't think communism would work even in a perfect world. I think it is inherently flawed.

Communism does nothing to encourage innovation because everything hinges on a state controlled economy. The problem is this is inherently un-natural. Governments move slowly, and inefficiently. Moreover, communism does not encourage people to work hard unless you threaten them. That's the only way that Stalin was able to get people motivated. Granted, it worked in some areas, but at a huge cost to human rights.