Earlier quoted context omitted.
Uh, Stalin is responsible for more suffering than possibly anyone in recent history. He probably killed more russian people than the german soldiers. His policies screwed up a significant part of the world for decades.
He also gave Communism a bad name, and, by proxy, Socialism. These systems of government did not have all of the answers, however we now have free market economics everywhere with anything vaguely socialist being absolutely taboo. We have not a lot of diversity in government, government is nowadays about managing a country rather than anything ideological. Some diversity is better even if other systems are not how on…
You should read the things Lenin did, and the many more things he advocated doing. Read his pre-revolution material as well, he was one of the leading theorists.
> These systems of government did not have all of the answers
That's not true, read anything by Marx, Engels, Trotsky, or Lenin and not only did they have an answer for almost everything, they (especially the latter two) believed maximally that there is "only one way".