Most books by Ha-joon Chang, especially 23 things they don’t tell you about capitalism. Fun fact, Ha-joon Chang isn’t a Marxist, he’s a liberal, but his writing is still critical enough of capitalism that South Korea banned his books.
Anything on prolewiki’s library are good reads as well.
For a broad look at the evolution modes of productions and how capitalism came to be there is this 60s textbook from the soviet academy of science, there even are a series of videos following the textbook by the finish bolshevik that is pretty good.
Cubans are more satisfied with their political system than americans
According to a bunch of polls, in the majority of former eastern block countries most of the population (as high as 70% and no lower than 40%) think life under socialism was better. Also, you were literally given a big list of sources for the USSR example. But clearly didn’t bother reading any.