metacritic just takes an average of all the 'professional' (= paid) reviews. those are all biased as fuck. the reviewers get the game for free, the deluxe edition with all the goodies, preorder bonuses, a bunch of other shit, and they know that if they give a bad review, next year someone else will get all the cool shit. also, people are more likely to read a 9/10 review than a 5/10 one. positive reviews = more ad income.
user reviews are much more reliable. idk if there is a site like rottentomatoes for games. steam reviews are not that good either.