Don't read reviews from sources you don't trust. If you have a built in distrust towards platform specific sites, then don't read them. What I would say about Metacritic is to ignore the score completely and use it (or OpenCritic/GameRankings) to easily have access to whatever reviews you do trust. A lot of people trust the reviews on platform specific sites like NintendoLife, XboxAchievements, or PlayStation Universe, so they can be there.
EDIT: Also, no reviewer is capable of being completely and truly unbiased about every game. Everyone has pre-conceived notions and thoughts. Anyone who says otherwise is wrong.
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