Rating a pokemon should be based on constructive feedback rather than an irrelevant, unknown number. Such as: Is it's nature good? Does the moveset tie in well? Are it's IV's for what it's capable of decent? What is the better nature? Etc.
1/10; 9/10 should mean little to the player asking the question as the player who answered that question came to that number based on their own personal opinion and strangely calculated into thus random number. I find ratings, when presented correctly, a nice interaction when does as such as the above and with enough of the same opinion, a good way to determine if the pokemon is worth keeping or scrapping.