The problem about Capitalism is that it sucks, but compared to the alternatives, its probably the best we came up with.
Socialism is beautiful, but Marx, while writing "The Capital" took heavily on Rousseau thinking that men is inherently good. I am not saying most men are evil, but there are some pretty bad people out there, and usually they are the ones who end in a position of power. One only have to look to the socialist countries of today to see that unfortunately the transition from socialism to true communism is impossible thanks to the need of having a leader figure to start the process, and that leader figure ending up becoming a dictator( Fidel, Mao, Lenin and Stalin). On paper socialism is perfect, but since men are not, its doomed to fail.
It is my belief the Anarchism would only lead to a fractured society, that in time would have to rebuild the current power structure. Its pretty cool to believe we don't need a government, but when there is no police who will stop someone to stealing your stuff? Your community? What about that other community thats twice as big and wants your stuff? You better get some other communities to join you, and then the politics start all over.
Theocracy would work if everyone would follow the same Religion, and in the same way. Pretty impossible, since the evolution of ideas will always make people interpret things in a different way.
I believe there no need to address Monarchy and Feudalism.
So when all is said and done, what alternative do we have today?