Assuming you genuine want to learn why Capitalism is both the opposition to real freedom and why it is not the best system to provide us then this is a decent enough place to learn.
Their are many critiques of Capitalism starting way way back to its very beginnings and from these critiques many different ideology's have been created. Many focused around the central tenants that
Private control over the means of production (physical, non-human inputs used for the production of economic value) is Unjust and unnecessary. The Private ownership of the Means of Production creates a Class struggle between the Owners of the means who are now able to profit off of the labors of those without access to the means of production.
Many people have gone from rags to riches yes; but the vast majority do not. As well as this those who do; do so off of the backs of the people in rags who's labor is exploited and profit derived from.
"It is only by the abolition of the state, by the conquest of perfect liberty by the individual, by free agreement, association, and absolute free federation that we can reach Communism - the possession in common of our social inheritance, and the production in common of all riches." ~Peter Kropotkin
"Let us fight to free the world - to do away with national barriers - to do away with greed, with hate and intolerance. Let us fight for a world of reason, a world where science and progress will lead to all men’s happiness. Soldiers! in the name of democracy, let us all unite!" ~Charles Chaplin
"Communism is Anarchy. You can't regulate or reform your way to communism; it can only be achieved by direct action against state, class and capital."