Full of frustration, equipment you cant preview (and thus might kill you), enemies that love to change their pattern just in time to kill you, and a tendency to make you want to explode when you lose that *one* item.
Would be a five star for me... Except the Sad Village dungeon makes me nauseous from all the movement and thus I cant beat it. Really needs to be a motion sick friendly version of that one!
AingealWroth about Deep Dungeons of Doom