For the last time.....
A score of a certain number right now cannot be compared to the same score from years ago. As games as a whole progressively get "better" the ante continues to be upped and review scores shift accordingly. If this were not the case than games that got perfect scores originally, and have sequels that are even better would have to get scores that are off the scale to keep the comparative balance(IE since halo 2 is better than 10,10,10 halo:CE, it would get something like 11,11,11). As expectations are raised, the value of the different scores needs to be adjusted.