ICO rating can be an option for investment, but we also need to look at it from various sides in making a decision when going to invest such as the development team, bounty manager. A good ICO rating does not necessarily mark the project well because it could be a fraud
You said a lot, there are some ICO ratings. They are not very realistic. They charge the project side and then give it a high rating.If investors easily trust those ICO ratings sites, they are likely to be deceived. When you invest, ICO ratings are just a reference, it is not the deciding factor.