They are capitalists, but you knew that when you asked the question. The system of wages, class division, and destructive policies against the working classes can all be found in China.
So the revolution failed?
That depends upon how one measures success of a Maoist Revolution I suppose.
China could never be communist because the conditions for such a revolution never existed in that nation. The same is true for Russia in 1917. Does that mean that either revolution was not historically significant? Of course not. They should be measured on their own terms.
Lenin and Mao required their own adaptations to create a revolution in their respective countries (just as "The Sons of Liberty" did in America). Often times such a move requires contradiction with the ideals for which one is fighting. Neither Lenin, nor Mao carried out Marxian revolutions. They may have adapted some of Marx's ideas. They may have used Marx's notions in their own philosophies. Yet, that does not make their revolutions socialist.
China's leaders met with Milton Friedman and carried out his advice. I'd hardly consider that socialism, nor was The Cultural Revolution. Leninism used a great many of Lenin's own devices, none of which are necessary socialist in origin.
The only certain failure is capitalism and the reasons are evident. There are 800,000,000 people going to bed hungry tonight. 1.6 million children or more will die from diarrhea this year. Millions upon millions of people will contract malaria, many of those will die for lack of a $3 to $6 bed net. The slums of Lahore and other African cities fill up due to policies, wars, and other encroachments made to expand markets and constrict costs for the businesses here in the west.
Families in a number of African nations were torn apart, people murdered, children used as slaves so that western women can wear diamonds and western arms traders can sell weapons to brutal and violent factions.
We've fucked a number of nations, Chile, El Salvador, Argentina, Uruguay, Indonesia, and the list can go on and on with
brutal regimes that committed genocides, torture, summary executions, purposeful starvation, mass murder (in which our people participated) - all to provide favorable environments for our views and our corporations. Some of our companies have even been complicit in aiding these regimes. Ford Motor Company (to use only one of many examples) provided the Argentine security forces with a fleet of vehicles and helped construct a detainment and torture facility - right next to a Ford manufacturing plant!
Capitalism fails on every level. It is inhumane. It is corrupt. It does not prevent war and bring people together - but instead promotes war to build mercantilism and tears people apart with alienation and class warfare. It promotes the elite and a Randian-style justification of egocentric, self-destructive psychoses. At the end of the day, we can take heart that capitalism is its own worst enemy. In this case the piranhas eat one another.
Don't believe me? Take a look at the callous attitudes towards human life on display in this very forum. America is fully justified to enter any country to further her goals. And America's goals always mesh with capitalist goals.