You can do your personal ratings, some news website can do their ratings, its all only words not facts because its often impossible or extremely hard to attain knowledge that will allow you to do such rating. In most cases you dont have access to company/project insider info which would only tell you in reality that its worth it or not. Most that come out of companies/projects are marketing=lies.
Personally, I won't trust ratings since I've seen some icos that have high ratings but turned out scam then had my realization that ratings is just fooling us yet they earn nice money.
Nowadays, it's hard to spot a good one and with it look for a variable and rational product that can be a use to sustain the project. Also clear your mind from investing from too much hype icos. For an instance, if you can take a break for a while in icos, then do so.