Most ICO rating websites give you enough material for you to dig through independently, BUT they also have a conflict of interest in that they allow payments to list your ICO - so it is in their best interest to list as many ICO's as possible - that can lead to miss information.
I would suggest you take the popular ICO's and inspect it closely, see if it makes sense - or if it is just another pump and dump.
Also, gather information across various sites as this is a very new space, people are using varying methodologies as indicators for value propositions. Some are intelligent - others are not well thought through.
You don't want the tide to go out and leave you standing on the shore with "TRON" for example.
GL!
This precisely. If you skim through the announcements a bit you'll find a lot of sketchy ICOs that still manage to get a favourable rating. If these websites are indeed being paid by the ICOs they're supposed to rate (and there is no reason to assume differently) that is a big big big red flag. So X7's advice is a good one: just use them to find links, websites, forums etc and do your own research.