i feel like some people are making up imaginary posts and then get defensive about them.
i really don't see many people saying 83 is a bad score. if we judge a game's quality by only it's score, it's definitely a good one. it can't be denied tho that MOST people were expecting a higher score than the current one, based on both kojima's past games and some of SIE's big recent games. the fact that this didn't meet those expectations doesn't immediately make it a bad game, and people pointing that out aren't saying it sux either.
it feels more like the people who were expecting a 90+ game are getting defensive and coming up with reasons why it is the way it is, when the simple reason is that some reviewers (who HAVE actually played the game) didn't like it as much as they expected to like the game when they play it for themselves.
some of the made up narratives here are just absurd. the US/EU thing, saying "oh i can't enjoy the game now?" and acting like people will call you out if you say you're liking it, saying giant bomb is just shitting on the game for no reason, etc. those just come off as defensive arguments that try to justify why the outcome is what it is.
at the end of the day, the game is well received, and the reception and the few low scores would in no shape or form change your experience when you play the game.