I think they're pretty good, but they aren't ranking solely on individual skill.
very average players like fnx, neo, friberg, etc. get on the list because their team wins a lot
also, lots of overrated bots with inflated stats get a much higher rank than expected like s1mple
They take in considerations: all the stats, playoff stats, wins, mvps, evps etc
Nothing in perfect and no matter who ends up first this year there will be a lot of people mad
imo, the most objective ranking out there
quite a lot of bias towards good teams
its pretty accurate and predictable, i make a shit load of money every year from betting on the player rankings
They are biased too because they're personal opinions and little bit of big event ratings in the mix plus trophies, mvps.
i think that im the 7th best user, not the 9th