I really like them. There's a bit of "Communism bad" stuff in the first two games although you can easily interpret it as the Communist faction being more of a LARPy militia who are mostly aesthetic, and in Exodus there are conversations in which the canonically smartest member of your group distributes Maoist theory which is surprisingly based. The second one also lets you liberate a Neo Nazi death camp which is definitely cathartic.

Beyond the political side I'm generally a sucker for the vibe of them, and it's cool to see an apocalyptic setting that isn't America for a change. The fact that it portrays the majority of Russian survivors of a nuclear war in a sympathetic light is a much needed antidote to the Russophobia in a lot of modern military shooters IMO