The main issue with quests is in Avadon I found so far (first of Jeff's games I've played), is that there is no way to know where the quests are or where to complete them. I just keep going through dialogs and people endlessly, seeing if they have new sidequests, which gets a bit annoying after a while. Also it is a waste to miss side quests.
Often I also pick up quests that I already completed, sometimes without knowing. So I spend time trying to complete a quest I apparently already completed, which again is slightly frustrating at times.
Secondly the quest texts aren't always that clear of when or where to go.
I absolute love Avadon so far and almost finished it, but for a new version I really hope for a more extended quest log and a clearer way of identifying quest givers (new and completed).