What was so different about Romanian/Polish/Czech/Hungarian socialism that made so many of them seem more reactionary?

Perhaps I’m making a generalization, but from what I hear these people were the most comfortable with Western ideas and bourgeoisie domination. Is this true, because the Imperial Core has awful lies about the USSR and I’d like to know more about the USSR accurately, even the Westernmost areas. I might as well toss GDR in as well, basically just lmk about Western USSR bc I have literally little to zero knowledge of the policy or differentiations of these SSRs, thanks