I think this may be old wounds from other MMOs. I've been around for over a year and I STILL reflexively read and "good job" as sarcasm.
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The only level 70 extreme I ever saw out of 2000 roulettes is Rathalos. I got it DAILY. LOL - not an exaggeration.
The rest are ARR and the occasional Thordan and Bismark. I never saw the other 60 extremes queued. I've only cleared Thordan once. It is nearly unteachable and most mentors who get trapped in it doesn't know the mechanics either.
I think the NN on each server might be different. Leviathan's is pretty good. It serves its purpose on multiple levels. New/returning players ask their questions and get their answers. Mentors and new players chat with each other, creating some camaraderie among the playerbase that can last after the player has moved out of the NN.
It might just be what the community makes of it. If it doesn't work for you or your server... don't join it.
Gilgamesh's Novice Network is plenty helpful! Sure things descend into horny jokes and silliness every now and then, but the mentors there are generally understanding and eager to help when asked and available. Of course there are bad faith mentors, sprouts, and returners, but we self-police pretty well.
As someone who's never had the need to interact with other Novice Networks, I honestly can't relate to any of the negativity being said here.