Everest delivers things that are not expected in a non-Disney ride on a big scale. There is no other place on Earth except a Disney park where you have a coaster integrated into a 200ft recreation of Everest. Everyone else, puts their raw coasters onto a concrete slab and leaves it at that. The next (rare) stepup up from that, is to put the coaster into a warehouse, such as the Mummy.
Everest is a thing of beauty to look at, high on detail and authenticity, combined with a thrill ride, with an incredible animatronic. That's a pretty good combination to me. It's certainly something that no other company in the world has, or could, pull off.
I agree that there is always more that could be done with an attraction. I would like to see more show scenes, more animatronics, and more unique elements. However, I also recognise that the $100 million + price tag to build the village and mountain puts a financial contraint on things. The line has to be drawn somewhere.