Fine I'll give in to your demands of you explain how communism is the best form of society and how it can actually be implemented.
For one no country that has claimed to be communist has truly been communist or even close to what a communist society would resemble. That is no one entity be it corporate, state, or individual would hold explicit claim to the production of anything, be it assests, technology etc...as these would all be "owned" by the society. This wasn't achieved in any of the "communist" countries.
Communist countries that have existed also fail at allowing the people of that society to be anything they please at any time. This would eliminate stratification of society and help decease the exploitation of individuals by others. It can be argued that this has been achieved to a greater extent through Capitalism than the "communism" of today.
Sounds all fine and dandy. People can do as they can please and everything is owned by the people, that is the meams by which goods and services are produced. Given human nature though a system like that can not be achieved as evident by all the self proclaimed communist countries. The consoledation of power is so great in these and former countries Marx would shit his pants so hard his intestines would fall out.
Like I said earlier a society that models Communism may be possible in the future after great technological advances, and more graduay shifts towards socialism in a greater number of nations, but for the forseebale future, it doesnt work.