I think the main problem with this movie is a loose focus. It seems like they tried to make a disaster, drama and documentary stories at the same time but failed to develop any of that properly. But the good things first: stunning scenery, overall tension and a few really great scenes make this movie worth watching without a doubt. It is just somehow not working as a single piece. With a fast start you expect some eventful action to follow but there's nothing like that. The characters developing is limited to a couple of sentences excluding Rob Hall and Beck Weathers what makes others a little more than forgettable 'guys who die first'. For some reason, Scott Fisher, being a smart capable mountaineer is shown as a careless hippie-like person, Anatoli Boukreev as a cliché tough Russian playing garmon in a tent, Beck Weathers as a hardly-realistic guy from Texas. But it doesn't matter anyways as when the masks put on it's really hard to follow who is who and and their position on the mountain, especially on descending. The whole day of May 11 is clumsy and hardly could be learned from the movie, on the summit the story switches to Rob completely and gets distractingly touchy-feely then slowly turning into the aftermath. The drama feels a bit out of place when other participants dying with little or no attention. I was disappointed. The most vivid scene of the movie turned out to be shown in the trailer (crevasse ladder). Another Beck Weathers scene was really powerful too, but otherwise I didn't feel the pressure of surviving, the height itself (the stormy clouds could be seen from 2000 as well), an incredible effort to even try to step on that track.
Andre Bredenkamp writes about Everest climb: "You get completely disorientated. I had to keep reminding myself I was climbing a mountain. Every step of the way I had to try to motivate myself. At that altitude I took at least 10 to 15 breaths each time I moved one foot."
So if you really want to feel the height I would rather recommend to read the books about that night as this movie failed to show it properly.