Those rankings are mostly paid. I don't trust any scores and prefer to judge myself, after personal experience and researching of the subject. Other brains will never replace yours so that work on your own opinion.
They are still useful to make quick judgement though and if the reason behind why we look up certain project in ico ranking is not as crucial as investing. The sole reason of that site existence is for money and that's why many websites similar like that eager to advertise themselves in many crypto groups, to gather views which means a lot more money.