Okay.Notwithstanding anything else you're talking about, this idea needs to die an immediate death. There is no video game reviews arbitration board defining what a low score means. If you as a reviewer have the best time with a game you've ever had in your life but find the subject matter to be disgustingly abhorrent, you're well within your right to give it as low a score as you want.
In the critical evaluation of the reviews themselves or of the media that's being reviewed?There is no "A for effort" in the critical evaluation of art or media.
I feel that "B for effort" definitely exists for high-profile games that aren't very good. Dragon Age II, for example, I don't think that game got scored on anything but effort. If that had been a Russian game only the same game, I imagine the only people who would be for that game would be weirdos in threads on here going "It's really good!!!" frantically to get others to play it too.