Lenin's State and Revolution is great and set the foundations for the Bolshevik discourse that led to them being capable of leading a movement large enough to gain power over Russia, the problem is that not even Lenin himself was consistent with the principles he proposed. The idea that you can legitimately sustain some sort of pretension of achieving worker democracy when the Bolsheviks consistently ended up repressing all other leftist factions wasn't coherent, to the point that Stalin wasn't a sad degeneration of Leninist practice, but a necessary consequence.

We unfortunately see the same result in almost all countries that followed the ML model, where a party elite ends up monopolizing power and divorcing itself from the rest of society, ultimately instituting themselves as a separate class that sees no ideological issue with bringing back capitalism, as they find it to be more consistent with the really existent power dynamics in the country.