Yes, I agree.
D:OS1/2 both have this issue where it's a reverse difficulty curve - where it gets easier as you go simply because you get more abilities and pure power and enemies simply do not scale up to the task sufficiently there, while earlier levels is where it is pain in the ass with limited skillset and rags.
Also yes, Arx is a letdown because there could be so much more done there. So much unused environment there, while the main quest is somewhat vague and incoherent.
The game is great, but Arx is not the highlight it should have been.
