Listen man, you might disagree with Marxist-leninism but it's not capitalism. Cuba has a planned economy and private property has been outlawed.
Marx would probably call that "the lower stages of communism"(read crtique of the gotha program) this is what is commonly refered to as socialism per lenins redefining of the term.
Anyway, the only people who claim to have reached communism were Anarchists in Ukraine, and that doesn't hold up to critical examination.
We live in capitalism right, so the only two ways power can be achieved (let's not kid ourselves we want socialists to gain power) is by aquireing capital or violence. I think the former actually can work.
Violence is seen by the general population as a negative, right. The masses at this moment in time aren't supporting a socialist revolution, so there is no hope for a violent struggle.
So we've got to play the capitalist game in order to gain control of the means of production and political power.
RE: The expectations of Capital and the ism's of Capital