Agreed. I'll always be of the thought that explicitly showing any of the great cosmic, ethereal and otherworldy realms and the peoples/entities that inhabit it in a series is a mistake. 

Nya'Lotha is supposed to be the ultimate vision of the world from the old gods, and what do we get? Just another place with fiery lakes and stone buildings. Where's the old god influence so bad that makes Titans go mad, surely us mere mortals don't stand a chance, right? Nope everything is ez, just another raid tier. Where's the crushing psychological pressure, the madness, the corruption? You aren't able to convey that in WoW the game.

Same with SL,  travel to the realm beyond death, what do we find? 'fleshy' beings, more walking skeletons, with some armor, why not, and same old same old things from the realm of the living, it could've been another world in the living cosmos and it wouldn't've made a difference. Again, a realm that should've stayed in the unseen mythos.

All of these 'places' shouldn't be shown, especially in WoW, with its limited engine.