The biggest problem they fall in is constant universalism. Anything that is not pure in content, anything that includes any particular solutions to concrete problems, especially if it deviates from the Idea of Full Communism is deemed as a betrayal of the revolution. (Check out the conceptions of universalism and particularism in Hegel). Just to give an idea, he criticized Stalin for introducting wage-differentiation for different occupations (as in a doctor is paid more than a line worker). This was made to combat flight from factory to factory, in search of better wages and general reluctance to engage in more demanding jobs (as there were little to no incentives in the early collectivization phase). Since SU was trying to industralize heavily and was in need of experts, there had to be incentives for such experts to come to be. Trotsky criticized this as uncommunist, and insisted on keeping the wages the same for EVERYONE, as to build communism here and now, ignoring the reality that existed at that particular historical moment (and aleo because he hated Stalin).

Why do you consider Colonialism to be such importnat subject so as to make 1/4 of the course about it? Do you reckon it is of any use to a comrade in a country like Slovakia, which has no history of colonialism whether imposed or enforced (or am I mistaken?) And what about modern problems and possible solutions to them? What about the nuclear question, or the rise of surveillance technology?