The USSR was, as with any capitalist state, a counter revolutionary force and the working class experienced a degree of oppression and complete alienation just like any other place and the worst thing about this was it calling itself "socialist" and turning Marxism completely into a capitalist ideology. And in some points throughout it's history, it was a pretty terrible to place to live in, especially during the process of capitalist accumulation and counter revolution that took place under Stalin. Living standards dropped to lowest levels in history in peace time. But to call it evil would be to provide a shallow critique of it.
“All that a well-organized secret society can do is, first, to assist in the birth of the revolution by spreading among the masses ideas corresponding to their instincts, and to organize, not the army of the revolution—the army must always be the people [—] but a revolutionary General Staff composed of devoted, energetic, intelligent and above all sincere friends of the people, who are not ambitious or vain, and who are capable of serving as intermediaries between the revolutionary idea and the popular instincts.” - Bakunin the Leninist