While it's true that capitalism is a form of oppression, you can't read The Communist Manifesto nowadays without it being overshadowed by what 20th-century revolutionaries did in its name. In pursuit of ostensibly good/just things (overthrow of the oppressors), they ended up creating a system arguably as messed up as its predecessor. Unfortunately, it seems that when The Communist Manifesto is put into practice, the state becomes the oppressor in lieu of the bourgeoise.

Still, I don't think it's right to dismiss Marxist thought completely. It probably just needs more fleshing out, more safeguards, etc. I'm sure there's been loads of learned responses to it by philosophers and political scientists in the years after its publication that perhaps offer improvements upon it. I'm a bit curious actually about what more contemporary thinkers posit, though I'm not sure if I'm up to reading more political pamphlets any time soon. Trying to think about a better system for governance/society makes me a bit depressed about human nature to be honest, since even things that seem just and good in theory become unjust and evil in practice, once flawed, corruptible humans turn theories into reality.