No one has to 'debate' high school level understanding of reality
Marx and Engels's reputation remains intact solely due to the bulk of their work being considered political economy. Their methods, however, had to be implemented from the barrel of a gun, and gave nothing of worth to the people who bore the brunt of this experiment. Famine, civil war, ostracism, stagnating economy (once funneling labour into the cities was no longer an option), alcohol epidemic (to end all alcohol epidemics), falling life expectancy and a population that dreamed of immigration - that's the legacy of a 70 year experiment in Marxism