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?
In looking for a good ICO, I have never used nor tried to visit ICO rating sites as they were too biased and somehow unreliable due to lack of evidences and proof. I choose good ICO based on their platform and uniqueness, and somehow their use and objectives.