I think that's a bit unfair. Their ideals did inspire a number of other countries to revolution, including China. The USSR did it first and its example was emulated by other countries with some local variations. Many of the early Chinese leaders were educated in the USSR and inspired by Lenin and even Stalin. I think it's only in our backwards looking view, having "won" the Cold War, that the USSR doesn't look so inspiring but to a early 1900s peasant, a successful peasant revolt that toppled a great empire is nothing to sneeze at.

It also inspired half of the world and had a massive cultural, artistic and sports influence across the whole world. Space program that was well ahead of the US for a good period time.

Classical composers as you mentioned, literature (Russian realism), opera & ballet. Russian academies in those areas are still considered the best in the world.

There was a brief period from about 1957 to 1965 where they seemed to be gaining steam; but other than that, it was mostly other dictators that tried to emulate and/or side with them, not general populations.