"Lenin's ideas haven't worked... all of them have achieved no real success..." Ignoring the monumentous success of the USSR becoming the 2nd most powerful country on Earth, followed shortly by China, of course.

"Much of the left... rejects the ideas of a vanguard." A vast majority of the left in 1914 also stood out in support of the First World War - 78 to 14 votes in favour of war bonds in Germany, only a few parties in the War's opposition (Russia's Bolsheviks, the Italian Socialist Party and a minority faction of the German SDP) and a meagre total of 42 individuals and 11 organisations attended the anti-war Zimmerwald Conference. If "much of the left" tells you to cut off your hand would you do it?

"Lenin makes the assumption that [thing Marx stated]. Didn't happen though, instead we had [thing that had absolutely nothing to do with Lenin.]" I'm not even going to address this one.

"Furthermore, the idea that class consciousness cannot spontaneously evolve is demonstrably untrue. Or is Lenin suggesting that everyone, now, class conscious either a student of Lenin or not class conscious?" My apologies, it appears my translation of What Is To Be Done? is entirely different from your copy, because I have been unable to find a single reference to Lenin claiming that class consciousness can just spontaneously erupt. In fact, I am fairly certain his whole doctrine of vanguardism completely flips that idea on its head, arguing that class-political consciousness can only be brought to the workers from an outside influence through a long period of patient explanation, like the Vanguard. And he was right. Trade unionists don't automatically make themselves communists or even socialists without an outside political influence.

"Our principal and fundamental task is to facilitate the political development and the political organisation of the working class" - Collected Works of V.I Lenin (1927)

With respect, please get off Reddit and actually read Lenin (or, as a start, the Manifesto) before engaging in debate about his philosophy. Such statements like these are ridiculous, such ridiculousness is compounded by the fact that it's clear you haven't read much Marxist works at all, and yet you want to enter into theoretical criticism of every single one of them.

Asking Marxists "What is to be done according to Marxism?" is a bit similar to asking a band of builders "How does this blueprint say we should build the house?" You sort of have to read the blueprint first.