WHAT IS HAPPENING
All reviewers have bias, whether positive or negative. Not all acknowledge it. This is essential because all consumers have bias, as well. Gamers with a positive Nintendo bias read Audrey's reviews and agree because they feel the same way about Nintendo games; she speaks for them. If the game is enjoyed like a 9.5 or what-have-you by a large audience, doesn't it deserve to have even a single 9.5 representing that audience? Likewise, the game didn't get straight 9s and 10s. It got some lower scores from reviewers who didn't enjoy it as much.
You might suggest that some people would play this and enjoy it so little that they would give it the lowest score possible. That is true. However, these people would never play the game, and don't need to be represented by reviewers who would also never play the game. If I don't like anything about a game, I'm not going to play it, and I shouldn't care what kind of reviews it gets.
All reviewers have bias. A truly unbiased review would be quite uninformative.