I've actually done a lot of Roleplaying/Mysteries with this group: they were doing urban exploration in the City of Brass for a few months. But when it comes to blows, they've been unstoppable. Now that they're in a more traditional dungeon setting (an abandoned dwarven subterranean city), there's nothing left to challenge them. I've had liches, dragons, swarms of orcs, powerful undead.
The book doesn't seem to know what it wants to do. It tries to suggest playing it in the style of classic fantasy, heroic games (like D&D) but the system doesn't seem built for it.
I like to think I made an informed decision - or at least as good as I could have at the time - based on the wishes of my players. Something very rules lite that can have satisfying sessions in 2 hours of play, which can be played by voice only and no maps or minis (since it's a voice chat game over distance), keeping with a traditional fantasy feel.
Implementing the GM moves seems a little weird. Like the barbarian rolled snake eyes on a single attack roll, so now I get to separate the whole party? Like that doesn't seem to fit the fiction at all.