This is a nice topic (and hellu to everyone here on the OE forums).
Something that struck me as far as writing goes was in (surprise) Ps:T as well. When you exit the Mortuary, you can run into a NPC called Ingress who have lost her way from her homeplane, and now she can't find a portal back. I think she had tried in the past but something awful had happened (can't remember the details).
Anyways, when I ran upon that quest, that was when I knew Torment would be a special game. I actually felt genuinely sorry for this NPC, and I really wanted to help her out. It was a fairly simple quest, but I was really satisfied with myself that I had been able to help poor Ingress at the end.
Lots of it had to do with the great descriptions when talking to her. A really wonderful moment.