Fail point is fail. Naturally there are some sights that are very beautiful and spectacular from above. But generally, they look more impressive or overwhelm you more if you are at ground level. Ulduar is a great example of my point. Fly fifty yards to the left and you'll see an awkward horizon, a bunch of low res mountain-resembling shapes, and a vast empty void. Sure, there are less-than-spectacular sights on the ground as well, but the ground is much easier to design in a way that shows the good side of Azeroth to the player, and it shows.