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?
Sometimes, ICO rating sites are manipulative, this is the reason why some other ICO succeeded in their required capitalization because of the high rating from the ICO rating sites, but for me, it doesnt matter anyway because i always look on the probablity that the project could perform well, if we just based on the product that they could promote, second thing is that the community support from their social media, thats the important thing for me, ICO rating is useless for me, because of the reason that i stated above.