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?
I am agree with you, last year I have participated in more than 100 ICO's, you will be amazed to read that those ICO's which gave me smart profit or earnings were those ICO's which do not have any ranking of ICO ranking websites (Like GBX), after that I have decided to check the profiles of team members, their social media links and activity.