Aleksandr Solzhenitsyn was openly anti-Semitic. There’s a reason why crypto anti-semites like Jordan Peterson call him "one the greatest minds to have ever lived". The man was a fascist who described the Nazis as a "liberating force of Europe" and wanted the monarchy back in Russia.
It’s obvious to anyone who reads The Gulag Archipelago and then reads modern historical research on the USSR that Solzhenitsyn’s narrative is simply wrong. You can also look at the research of a number of historians including J Arch Getty. Even the author's wife admitted that book was fiction.
Solzhenitsyn's Archipelago of Lies debunks inconsistencies within the book too.
While his book was an exaggeration and not a comprehensive survey of the gulag system, it nevertheless contains valuable accounts of life within gulags.
If you want a better critique of the soviet gulags and other abuses under the Soviet system, without falling to anti-communist propaganda, I recommend The Revolution Betrayed by Leon Trotsky.
It pretty much rips apart the direction the USSR took in 1923-1936, and pretty much applies to China today as well. It does start off very praising of the initial 5 years after the revolution "What a surprise as those were Lenin and Trotsky's years of power", but from chapter 5 onward it goes into the failings of the Soviet Union by redeveloping inequality, social antagonisms, the rise of elitist power members and workers as a class, going from full sexual and bodily rights to forced motherhood and illegalized abortions, disenfranchisement of the youth, forced national culture, its cooperation with capitalist states, the reinstitution of a Tsarist military structure, and how the central bureaucracy became a new ruling class oppresing the people.
If you want my opinion, Stalin was severely misguided as a marxist, a totalitarian who committed reprehensible acts to justify ends that weren't determined with the common working people in mind.