They seem biased to me. A friend of mine who's doing an ICO told me that they paid 10ETH for 5 quality ratings and that's that! I noticed that some ICOs with good project, team, and good social media presence are struggling with getting good reviews.
With all that said, should it still be a factor to look at when investing in ICO?
No, i dont trust ICO rating sites because they are just paid to make good review even though the project is not good enough. Many people are losing asset because they invest to not so good campaign review by the ICO rating websites.