The only DF extreme I've ever run into issues with consistently is Ramuh because of the tanking requirements. It's pretty rare to see a party fail to clear anything else since Echo is so ridiculous, and the total delight of the newbies when it's killed makes it super worth it.

Most of the time parties end up having to disband not because of the content, but because of the utterly useless mentors that immediately leave and then queue back in 3 times in a row only to leave again each time. ¯\_(ツ)_/¯
If you're a PVE mentor and die 5 times consecutively on Alte Roite normal, maybe it's time to ditch the crown!

If you can't handle the content in the roulette and aren't willing to teach it, do us all a favor and just stop queuing.