(pardon the posts, can't edit on phone)
Fourth, the NM fates in here are actually challenging and you can die if not careful of your surroundings.
PoTD bores me to death, same as Diadem, hunts and trash mobs in dungeons. Eureka I actually like, I have to actually read what Krile says as the quests don't hand hold you, people actually have to work and communicate together besides the usual just "hi", I have to actually pay attention and push my dps to achieve those exp chains, aid my team mates from ultimate death, it keeps me on my toes.
Could it improve? Yes, a lot. Starting with the rewards. Upgrading the relic gear and weapon doesn't look to appealing when the gear doesn't even last. Add more spice to the exping, make the elemental wheel more engaging with the battles, make it matter more.