Nowadays many MMORPGs are making dungeons with straight corridors full of monsters, I don't like that I think it makes the dungeons very boring and monotonous, the first time we complete the dungeon it's fun, but in the others it gets repetitive and easy where you don't even have to pay pay close attention to what you're doing in the game to complete it.
My suggestion is that the dungeons are real labyrinths full of traps, monsters, riddles, secret rooms, it's history written on the walls, in my opinion these are all elements that make a dungeon an adventure.
Man, brings back memories of getting lost in BRD, BFD, and VC in wow. I would +1 this sentiment.