I have to wonder if there's a correlation between the way reviewers approach the game and their scores. How many are playing it with the minimum possible understanding of the combat? Just shooting everyone, with guns, from a distance or behind cover? That would probably make RE6 come off very poorly compared to other third person shooters.
On the other hand, you have people who are driven to experiment, to make it more interesting for themselves, and they end up getting into the combat system and appreciating the overall game more as a result.
You can play God of War, DMC, Bayonetta, whatever, by doing one combo again and again until everything is dead. But if you did, I wouldn't be interested in your opinion of the game. Those games, and perhaps this game, require some additional creativity from the player in creating the "fun."
It would be really interesting, now that technology makes it possible, to see 10 minutes of footage of the reviewer playing the game to go along with the review. I want to know how they play, not so I can say "lol playing it wrong, games journalism!" but so play style can become part of the conversation for more people. It would help give further context to the text and numerical score.
Yes, fanatics on both sides would use that information to discredit whatever they disagreed with, but that's nothing new. It would allow consumers to say "that's how I play games like this, and if he didn't like it, then maybe I won't either" or "That's not how I'd play this at all. I'm going to give lower weight to this review than I would have otherwise."
Please note this isn't motivated by any particular review or even this game in particular. I'm not trying to subtly insinuate that every low score is the result of "wrong play style," just thinking aloud about how that could affect scores in ways that are invisible to readers, but could be made more visible.