I'm not saying I am immune to propaganda, yet there are 2 sides on that coin. Censorship I already mentioned, then we have repressions, basically encouraging ppl to accuse each other, etc.
Eliminating unemployment and homelessness was also somewhat questionable, AFAIK: after finishing a uni, the future workers were forcibly sent somewhere to work for X (3, I guess?) yrs with dorms as accommodation to live with Y else ppl in the same room (so, a glorified homeless shelter). Now imagine that somewhere in Siberia. Although, yeah, better than nothing, I guess. On a side note, zero unemployment was "official", and I personally judge their openness regarding stuff they didn't like based on the Chernobyl accident's handling.
Free healthcare is great, no questions here. However, it wasn't pioneered by the USSR, but actually dates back to Alexander the 2nd's reforms (or even earlier).
So, that's kinda it, a nonexclusive list of reasons why I refuse to glorify USSR