Well, icobench and icoholder seem to be normally rate. But who knows, maybe scam ICOs can buy a good rating there.
It's unrealistic to buy ratings on all listings, there are more than 100 of them. And popular projects are analyzed by almost all top experts. It is enough to see one negative report to understand everything.
You can use the sites where project scores are collected from all experts. At cryptodiffer, for example, about 20 experts are immediately visible.
There is also
http://topexperts.io there are more of them, and the functionality there is better.