Well duh. For the Average Joe who lives in Russia, the Soviet system meant a working healthcare system, employment, and a retirement he could look forward to. The breakup and the resulting economic collapse definitely took a toll on the populace.
Just look at this graph. Only in 2012/2014 did Russian male life expectancy reach the level it was at during the 1980s:
The transformation was especially messy and, may I say, brutal in the former Soviet countries. There were quite serious problems in Poland or Czechoslovakia as well, but not to that extend. Russia basically became a grab for rising oligarchs.
Another factor was the specific distribution of industries in the USSR, like cotton being grown in Uzbekistan, but processing being done in Russia. It wasn't a big deal when there was one big Soviet country, but after the breakup.... you do see my point, don't you? Just like with the Crimean mess. Crimea was a part of Russia up until 50s when Khrutschev arbitrarily decided to transfer it to the Ukrainian SSR (Soviet leaders were renowned for making arbitrary borders. Stalin was perhaps the greatest geographic troll in history). Not a big deal, still the same country... until it fell apart.
For all naive romanticizing of the "glorious past" we can see why so many people feel that nostalgia.