Metacritic, and game reviews in general, are totally unreliable for many, many reasons. A lot of the time, reviewers don't get to actually finish the games before they have to write reviews. Games will get unreasonably high scores just because they're overhyped or from a big-name series. Games will get unfairly low scores because they're difficult, the reviewer just doesn't understand the game, or they're reviewing a game from a genre they don't usually like. Some reviewers only use the 7-10 scale (coughIGNcough), while others actually use the full 0-10 range. Reviewers can be bribed. Competitive games like fighting games or MOBAs are usually only judged by their presentation and content, while the core gameplay (i.e. the single most important part) will just get a "Yeah, it's good" regardless of if it actually is or not. The list goes on and on. In the end, when you try to compile all of this into one score, what you end up with is a number that ultimately means nothing.