Yes because they provide necessary information about that certain ICO and in this way you can use it as a basis on your research if you find it that good and accurate but you can use it as a additional information
I don't believe in them that much but at least they somehow give me some help me with my ICO research. After all, we still need these ICO reviews to get the opinions of the so called experts in the market. However, we should not just dwell on these review site's ratings. Their ratings do not assure in any way that the higher the projects get the more successful they will be. Apparently, that is not the case.