What do you like in a dungeon?

Question 3: What do you like in a dungeon? That is it that makes you want to hunt in one dungeon instead of another? What do you think it most important in what makes a good dungeon?
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http://wod.drocket.net/phpbb3/
DaBogmu wrote:I wish the dungeons had a goal to reach at the end. A boss mob or a item. Something to make getting to the end of a dungeon a nice feat.
Also I dont think it is fair for casters to be able to skip past covetous 1 and 2 even though it makes rescues easier.