Underwater almost seemed to be the next big thing. Since it was known that GW2 wanted to try it out, Blizzard's team decided to try it, too. And Blizzard being Blizzard they put gameplay really first. The simulation be damned. But still a siginificant number of WoW players doesn't like underwater. The three dimensions are confusing (they are a bit for me) and nothing really feels right.
And this really means something! Because you can't really remove underwater walking further from the simulation than Blizzard did. This is what underwater walking is like; is really like:
And this is Blizzard's version.
It rather feels like running on a small moon; whose atmosphere is filled with some very light, perfectly transparent and slightly luminescent liquid. Me, personally, I think it's a funny thing this Vashj'ir. But only because I don't try to think of it as water, let alone deep ocean.
Forget the simulation, concentrate on the gameplay. In Vashj'ir that's not just what the designers did (had to do). It is what the player has to do in order to have fun.
Maybe underwater isn't such a good idea in the first place? I had much prefered some outland(ish) planes with less gravity. The loss of the 3D certainly wouldn't be a problem; rather an advantage. Putting the gameplay first means to adjust the simulation to fit the gameplay's needs. It does not mean to ignore the simulation.
If I don't feel like I am underwater then what is the point of underwater zones?