That’s...true, but not in the way you seem to intend it. The focus on regimes espousing Leninism and its descendants to typify “socialist countries” as opposed to those following what Marx described (and objected to, but Marx doesn't encompass socialism any more than Lenin does) as “bourgeois socialism” and “democratic socialism” is a pretty big problem, especially when dismissing Western socialist movements, which are mostly in those categories, not Leninism or its derivatives.