I'd go so far as to say this is my absolute favourite soundtrack to date!
Hans Zimmer is quite literally a musical genius in my eyes and pushes the scope for scoring and sound recording. Just watch the youtube 5-part series on behind the scenes of this film, he'll try all manner of stuff so far from the norm that it's absolutely inspiring and refreshing to see and hear. Whether he's using 10 of the best drummers in the world to drum synchronously to make a thunderous rhythm section, to using the craziest of contraptions (rather than just relying on synths) that create the most organic and epic sounds you'd never be able to recreate. This soundtrack hits the mark for me, conveying emotion and power in the bucket loads. The soundtrack alone has made me watch this film far too many times that I dread to say.
Hans is always pushing boundaries, he takes the beauty of orchestral instruments but manages to fuse them with all manner of massive, gorgeous, eerie and spectacular sounds. Don't deny yourself the pleasure of this CD or the movie, I even use the soundtrack to push me when working out, it really does excite me a little too much!