Unfortunately, Metacritic makes any and all attempts to change review scores moot. You may be able to tighten up the numbers somewhat, but the problem cannot be corrected. Review scores are eye grabbing, and many review sites pay their editors by either page views or ad revenue.
I honestly think you're being too kind. Review scores do more than interfere with the politics of game development. Many review sites report their opinion on a game as though it were fact. It's practically an art critique - the snobby, obnoxious kind. This, coupled with the score, distract from the game itself. The result is people stop talking about the game, and instead get into pedantic arguments about the politics surrounding it. Sometimes the editors themselves fall victim to their own trap. Kotaku is especially guilty of publishing reviews that barely even talk about the game. Check out their Far Cry 3 review to see what I mean.
I unplugged myself from games media a long time ago, and rapidly found that the games I liked were not the games that got massive coverage. People don't need to be told what they like. They just need to know what a game is going for, how close it comes to that, and how well it runs. Scores do not communicate that information. This blog and a couple of YouTubers are the closest I come to reading reviews anymore, and not even to learn about games; I just like hearing what certain people think. I honestly wish Fex would outlaw review scores here. But it's a small site and needs revenue, so I don't think my plea will be answered anytime soon.
Artificial difficulty, dood!