Let's not forget that the main reason review scores seem inflated is because review outlets generally do not review shitty games (because they know no one cares about them). The review scale isn't broken or biased on the reviewer side as much as it is biased in the game selection side.
Anyways, on the topic of Pokemon, I think such a poor score doesn't make much sense. As others have pointed out, there are many, many other franchises (and genres, even) that have changed very little over the years. Pokemon has found its core style and it has been building on it ever since. I'm all for the advancement of the series (I sometimes wish they would push the innovative envelope more) but giving the game such a low score when they give madden, call of duty, etc. high scores seems wrongful to me.
