There are plenty of aspects you can be completely objective about. It should be even easy when there are many times categories for every score. Graphics, gameplay, story etc. How hard can it be?
"This game is a little below it's peers in graphics" score 9.
"This game is well below it's peers in graphics" score 7 or 8.
They should always judge things compared to it's predecessors and peers so if a franchise keep...