Crypto rating site is very useful, but we should not relying 100% just from the rating site.
When we want to buy some coins to hold, we must take a look into the project as well, not only from rating site.
Once we get enough information about the coin, then we can decide if we want to buy it or not.
Yes, it means that someone has to do research from various sides to find out the right information on a coin that he wants to buy, because if only one side is very risky as well and it is feared that the information is false or completely untrue as has been seen on several sites coin rank.