Citing Lenin for a critique of capitalism's trajectory is a little bit like asking a prosecutor to write the defense's closing argument. He was a smart guy, but he wasn't some disinterested analyst writing a symposium on capitalism versus socialism; he was a revolutionary leader trying to build up support and justification for overthrowing the system.

But even if we overlook his inherent bias, he was just plain wrong. He wrote that capitalism had reached its final stage through imperialism, and that, as you said, state capture via financial oligarchy was inevitable. That was over 100 years ago, and history has produced welfare states, labor protections, financial regulation, the SEC, Germany's codetermination laws, even the Nordic social democracies. None of those should be possible under Lenin's framework for capitalism.

(Disclaimer: I'm all for common sense regulation of capitalism.)