As someone who's trying to enjoy Blackreach's last hurrah, I'm finding the night market to be a tad too grindy. Not enough sources of reputation, I've had some bad luck with lead drops and minion egg drops. Overall, its like it wants me to spend hours and hours in there, and I think of it more like a trial - I just want to do a run and get it done and get out.
I'm glad for the content but it reminds me too much of Imperial City to not make me just want to go back into Imperial City! Dark and spooky, lots of adds, wandering bosses... only seeing another player sneak by is less cause for alarm. PvP instance when? :P
My biggest saving grace for the night market is how long it's running. I don't feel pressured to grind it but when I do go in and spend some time there I feel I'm filling goal meters etc at a fair pace. I'd put the difficulty at normal trial, maybe vet dlc dungeon for a couple bosses so far, but difficulty aside overall I'm impressed with how well balanced this content feels.
Gripes include invisible quest markers, low feeling population cap, and ESO's tendency to half-explain what I'm supposed to be doing (buried under npc navel gazing) but that's rpgs for ya.