Some of the dungeons (ex: deceit, wrong, shame) feel like they respawn exceptionally fast, often times I clear out a room and before I can move onward, it repopulates... I feel like slowing this respawn down a bit would increase playability, by allowing the dungeon to be explored without blocking off your exit. Of course, work your way too deep and you should have to fight your way out anyway =)
-shrug- Just a thought...