A 2013 Gallup survey showed that 66% of Armenians thought the dissolution of the USSR was harmful

In a 2016 survey, 69% of Azerbaijanis believed life was better under the USSR.

In a 2016 survey, it increased to 53% of Belarusians saying life was better under the USSR

Another Pew survey, also in 2017, showed that 43% of Georgians thought the dissolution was a good thing, compared to 42% who thought it was a bad thing.

In a 2016 survey, around 60% of Kazakhs above the age of 35 believed life was better under the USSR.

A 2013 Gallup survey showed that 61% of Kyrgyz thought the dissolution of the USSR was harmful, compared to 16% who thought it was beneficial.

A 2013 Gallup survey showed that 42% of Moldovans thought the dissolution of the USSR was harmful, compared to 26% who thought it was beneficial.[7] Regret about dissolution later increased to 70% according to a 2017 Pew survey, with only 18% saying the dissolution was a good thing.

Levada polling since the mid-1990s on the preferred political and economic system of Russians also shows nostalgia for the Soviet Union, with the most recent polling in 2021 showing 49% preferring the Soviet political system, compared to 18% preferring the current system, and 16% preferring Western democracy, as well as 62% saying they preferred a system of economic planning compared to 24% preferring a market capitalist economy.

https://en.wikipedia.org/wiki/Nostalgia_for_the_Soviet_Union

Further, let's look at the actual referendum:

Do you consider it necessary to preserve the Union of Soviet Socialist Republics as a renewed federation of equal sovereign republics, in which the rights and freedoms of a person of any nationality will be fully guaranteed?

Yes - 77.8%