Literacy rates and average lifespans skyrocketed under Stalin, actually.
Everyone after him sucked balls though and Russia's rapid development came to a quick halt. Russia went from being the first country in space to the run-down mess it was when the Berlin Wall fell and still is today.
actually? the point isn't that literally no good thing whatsoever happened under a communist regime. significant positive modernizations were made in many communist countries across the world. the problem is that the effects of these changes were outweighed to an immense degree by certain other negative effects.
Where i disagree is calling marxism, in purely theoretical terms, an awful idea. It was a magnificent exercise of intellectual pursuit despite what it inspired. Arguably as instrumental as Einstein, Nietzsche and Freud to 20th century thought. But here again we might disagree, i'm not really a pragmatist.
I'm not a big fan of Marxism, but I do acknowledge it's very easy to see where the appeal comes from. The problem is that the specific strand of Marxism which was behind the creation of the Soviet Union was truly awful- it's very easy to directly connect the ideology of Lenin to the both the atrocities and the stagnation that were the hallmark of so many communist countries.