I love the zone Vashj'ir. Every time I level up a new character I go through it in entirety. I dont have problems with the three dimensional nature of it. To be honest, I only had issues with ground targetted abilities, like Heroic Leap or Death and Decay.
However, a lot of people intentionally avoid it at all costs, citing frustration with its underwater nature. Is it the fact that quest objectives can be at higher elevations? Ground targeting? Atmosphere?
And is there anything they could have done to fix these issues for you? Maybe retooling ground targeting abilties to function with a target as the centerpoint? Having better indicators for the entrance to the caves?
Or os Vashj'ir unsalvagable to you?