As I posted earlier I think it's a result of metacritic "syndrome ". As in some people just look at the score instead of reading or watching a review.
Also a 7 out of 10 is still "good" on most review sites. Also I think it's only video games where some will look at a 7 as a failure. 7 out of 10 for a movie or other forms of entertainment people would still be happy with.
