Why can't they be ratings? This website is all ages, so some games have so are so friendly, and then there is games that are really bloody. so do you agree that this website should have ratings?
Maybe mild ratings. Just because the site is 13+ doesn't mean that 18+ content should be unseparated. Some parents are adamant about this sort of thing and may block the whole site if their child stumbles onto a game with a little blood.