Well, there is a basic problem with "scores" of any kind you didn't mention: They imply an objective comparability of something (art) influenced by subjective perception, which is simply not true. You can't really compare a modern, to a medieval, to an ancient cavern painting, you can't even compare modern art with other modern art, at least not in an objective manner, otherwise it would look like this: "Painting a uses a slightly broader color palette than b, while b's color intensity and accumulation is slightly higher than a's". Transported to games that would mean: "a has x times more polygons than b, while b has yadidadida [...]". Looking on games as an interactive medium it gets even harder, considering the player has a direct impact on the experience, "if you find the game pacing to slow, maybe you just played it to slow". Though, this already goes into the general problem of reviewing, if we would act consistent on this, every reviewer would have to say "if you want to know how it is, just play the damn game yourself". However, we all know, that it won't work that way either.
Personally, i don't mind game related scores, i barely even care. In a way, you are right, Jim, they won't actually hurt anyone, except maybe a game gets "bad" scores for whatever reasons, while missing the point of the game, it would then probably sell lower than it could and not get the attention it probably might have deserved, while other games get unreasonable high scores and so on and so forth.
Some around mentioned what sites like metacritic or game ratings contributed to that. Well, maybe I don't know exactly what you mean by that, but in the end, those sites are nothing more and nothing less than the extend of statistical expression to its end. To have one without the other would be at least totally inconsistent. Here again Jim says it just right, ?don't blame the knife for the stabbing, blame the stabber?, whoever that may be.
But then again, that's not even the tip of the iceberg of problems the game industry has to face.
In the end, keep your game scores, or throw them away, i don't mind really... but i friggin hate the construct of school grades, i think they hinder the potential of our society at the base, where the subjects to its wrongs can't even properly fight against it and i blame those who cling to this concept, just because it appears easier... though, that's another topic.
Also, beware the gloves, i suspect they have evil powers!