Scale from one to five

[KitanaiKoneko]

Between a three and a four. I honestly haven't even touched the dungeons from 2.3, nothing really in it for me.

[Arrik]

Between a three and a four.

^ This.

AK pre-nerf had one choke point: The Demon Wall. The final boss was too easy in comparison, and really needed to be a bit stronger. But as others have said, come out with Pharos Sirius difficulty dungeons (which I liked when everyone stayed/I ran with FC members) and it'll just drop off the face of the roulette like Pharos did until the nerf.

That doesn't mean you can't vary where the difficulty is placed to make each dungeon interesting, but they should be overall around a 3.5

EDIT: Kind of related, but I do think any dungeon with the word "Hard" at the end should be pushed up in difficulty a little bit, and at the very least feel more difficult than it's normal version...