I disagree that the show validates him. Sure he wins but there are multiple instances where we see that on the inside he is sad broken and lonely. Not to mention that he is corrosive force on his family.

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the thing about rick isn't that he's good or bad, it's that he's broken.

he's seen everything, been there, and done that, and just deals with it in the literal absolute worst possible ways, with the literal worst possible coping mechanisms. he's an iron-man of the concept of 'arrogant jerk who wanks to neitzsche', because he is that smart, and has seen everything. and he's so much of a broken piece of shit that it's worth absolutely nothing; less than nothing, because he takes refuge from the horrors of the world in his arrogance, to the point he can't actually see beauty or goodness or... any of it. there's an episode where he makes a friend, and he literally can't handle the concept and tries to break the guy. the closest thing he has to an arch nemesis (other than literally an organized multiverse spanning army of himself) is a perfectly mundane family therapist. hell, at the end of the first season episode where the aliens kidnap him and put him in VR? he shows he's not that certain, and he's just a scared stupid broken man, and being that smart has done him exactly no good, just overcomplicated solutions to the overcomplicated problems he creates for himself.

which is about as much moral judgement as you can expect from something so thoroughly nihilistic.