In kpop, overrated is just a buzzword to hate on all kpop artists. Especially popular ones.
I am sorry, but if you don't like an artist or their music and you think that your favs deserve their success that doesn't mean that they are overrated. It means that you are jealous and salty.
There is no group or soloist that is overrated. Every single person has their own struggles to reach where they are right now.
Just because you think that your favs are "more talented" or had "more struggles" doesn't mean you get to hate on other artists in the name of your favs. I doubt they want you to do that either.
Basically, stop using the word overrated. Cause the only thing that is overrated in this world is the word overrated.