that's why china is the world fastest growing economy?
Cuba?
communism states nowhere that you can't have personal possessions or ambitions, you're allowed to own your own company, you;re allowed to make money at it.
in fact lots of people in china do own their own businesses.
and businesses are allowed to grow, here is an example
http://en.wikipedia.org/wiki/Lifan
umm, again, Cuba, communism seems to be doing OK there.
so far as working harder to do better, the motor company that I linked above, that started as a bike repair shop and now is a global automotive manufacturer says that people do still work hard and do still better themselves.
so, that's a few myths dispelled about communism.
I believe that the main problems in/with China are it's human rights record. policies like one family one child, suppression of information, suppression of the media, mass poverty caused by the distribution of wealth, (mostly in rural areas, cities tend to be affluent).
it's not that communism is bad, and it's not that it suppresses peoples ambitions. rather that it goes against general human nature to be at the top of the pile.
however, we could say the same about capitalism, surely striving to be at the top no matter what goes against human nature to be compassionate?
the point is that no system is perfect, each has it's downfalls.
(edit: before anyone says it... yes, I know that Cuba is a small island, and that this is the only proven case where communism works, and plenty of people say that this is actually helped by various trade embargoes that should stifle the regime but have in fact furthered it. I know that communism is only ever proven to work in this one single case).