Many do want the USSR back, because it was generally a better organization of the economy than what Capitalism and in some cases fascism has done for these countries. People who lived farther from Moscow had it far worse under the USSR, of course, but the people legitimately seem to have more of a longing for the USSR than anything else.
If approval rating was anything to go by alone though, then we could say Mao, Putin, and Kim Jong Un were some of the most successful leaders in history, and I don’t think either of us are saying that.
My point is firmly against the idea that Socialism is bad because many people who lived in one form of Socialism hated it, that’s an incomplete logical chain.
For what it’s worth, I’m firmly pro-Socialist, just not pro-USSR. I firmly believe that workers should own and control the Means of Production.