Well, they wouldn’t, because not all of the nine thought the game was perfect. A 100 on Metacritic only means the game placed in the top score for a given publication (4 out of 4 stars in WaPo’s case, for example).
In games criticism, a top score doesn’t always mean a perfect game. It can mean the game met or surpassed the current benchmark in its genre, or it simply was good enough to be in a top tier.
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