There are theory and practice.

Theoretically classical Marxism (based on the idea of proletariat domination) became obsolete when informational society replaced industrial one and proletariat became a minority. As for Communism as an idea of perfect society, now there is no prove it is possible and no grounded plan to obtain it. On the other hand the idea of social justice will always be attractive.

In practice, all the regimes that proclaimed Communism as their ultimate goal were unsuccessful. On the other hand half-bred Socialism, which was implemented in Scandinavian countries, proved to be viable and rather nice. But you know more about that, Jo.

In ex-USSR countries Communistic symbols and rhetorics is a synonym of conservatism, patriotism and old-good-times for some part of elder population, nothing more.