This is like rating a game with a numerical score, it does more harm than good. Creates controversy that isn't needed. A games worth can't be determined unless you play it/read a few reviews.
Focus on creating interesting characters, suited to their role, in their game and diversity should be inherent. Diversity is lacking because most games use 'safe' characters, catered to the majority & social 'norms' or it takes a backseat to other aspects like gameplay or graphics.