I'm a Marxist-Leninist, I believe that the means of production should be owned by the workers and that the purpose of work is to produce things we all need to meet our collective needs.
Capitalism is a dead end ideology which leads to concentration of wealth in the hands of a tiny minority by design, and this minority of oligarchs exploits the rest of the people to subsidize their lavish lifestyle.
Furthermore, any system based around constant growth and consumerism is fundamentally incompatible with our continual survival as a species. We need a system that strives for sustainable use of our resources.