You're using the same argument capitalists use to dismiss socialism, namely that socialism clearly doesn't work because all socialist projects ended in collapse or continue in a state of poverty. This is, in essence, victim-blaming. Just as socialism struggles under the oppression of capitalist hegemony, anarchism struggles under the oppression of both capitalists and statists.
What Bolsheviks achieved was the betrayal of all who fought for the liberation of the proletariat. If power had gone to the Soviets as the Bolsheviks promised then the USSR would not have collapsed under the weight of its' contradictions. You speak as if the USSR only repressed the forces of reaction, but it also repressed the very same workers it claimed to support when they tried to claim the worker control of the means of production they were promised.