Michael Parenti's book, "Blackshirts and Reds: Rational Fascism and the Overthrow of Communism" has a chapter covering faults, or rather, ineffiencies of the former USSR. I would look up the exact chapter, but my I lent the book to my dad, who was very interested in reading the book. It's an amazing book, so if you end up reading the chapter, I recommend the rest of the book as well :)!

If you don't have the means to buy the book, then it should be available on a lot of different sites, like archive.org, libgen and so on.

Also, shameless plug for the Michael Parenti video archive on YouTube.