Marxism-Leninism posits that we should create a working class party, study the given conditions of the country we are in (history, contradictions, class struggle) in order to correctly identify the key issues to organize around. In doing so, the working class needs to gradually choose the vanguard party, meaning a vanguard party that fails to do so is no vanguard.
This. This right here. What is the vanguard party? Oh, it's the party the workers rally behind! We'll know it because the workers will rally behind it!
Marxism is a useful analytical framework to use when looking at capitalism and alternate systems
Ml is a belief system full of holes plastered over by no true Scottman logic. No part of it is effective in the current day and age as political guidebook, we live in an entirely different era