The thing is there is not enough evidence (screenshots, videos, even logs maybe, etc.), so it is hard to get an actual and accurate idea about how good or bad the player is.
For example, in Native, almost every official match have screenshot evidence of every set or is recorded. Also there is (at least for me) a new system of statistics, where in some tournaments there is someone to make a big table with performance of every player who played even just one set.
So don't really think that melee guys had it easier, as these ratings are still heavily opinion based and based on how do we rather remember certain players, than on their real performance, as we simply have not enough evidence.
kek