I don’t think I quite understand what is meant with childish here. The story and how it is presented certainly is ridiculous and silly. But I feel it’s very far from stuff I’d find suitable for children.
Bastion tries to have a discussion about free will and is quite focussed on ideological strife and betrayal. They certainly do it very badly, but nothing about that idea is childish.
Maldraxxus is full-on body horror with corpses, blood and pus everywhere, and people treating slaughter like a joke. They are certainly making light of it, no question about that, buit those are not elements you could ever put into a childen’s story.
Ardenweald isn’t that childish or Disney, either. Indeed, most of its stories come down to tragedies, where the characters have to let go - or even personally kill - something they love dearly. I certainly hated the tone there, and the fairies that are supposed to be a counterpoint to the sad tone are mostly just annoying, but the zone is not child friendly.
And Revendreth is a straight-out torture realm where you are asked to personally help with the punishment of souls, and where it is made very, very clear that there isn’t much that is fair about the way the punishment is dealt out there. The delviery of that story is flat as can be, which certainly makes it hard to take it seriously, but it’s not the subject matter that is childish here.
And I really hope I don’t have to explain why the hellscape of the Maw is not supposed to be childish. It’s frickin’ WoW hell, with all that entails, and nothing is making light of that.
So I really would take the word childish out of that discussion. Ridiculous or silly should work well enough, and be more fitting, since it’s really more about the execution than the basic concept here. And I certainly agree that the comedic relief that WoW always included isn’t landing anymore, if it ever did. The humour is not only flat and obvious, it’s stretched out over months, where it loses all the charme it might have had. It’s bad enough to listen to a bad joke once or twice, but it really gets annoying if the same bad joke is repeated hundreds of times through the months. It’s one thing to have that stuff in a quesline that you play and forget, but as a feature race, like the stewards and the fairies are, and tied into the daily content… well, even people who found them charming at first might be happy to have a “cho-hooke 10 stewards to death” quest now.