I'll start off saying this: I wasn't too impressed with John Powell's music (apart from Bourne) until I heard this album. It has 25 tracks, but is not repetitive; epic, but not overwhelming! The Jonsi track, being the only one with vocals, impressed me as well. It features original themes with great viking-like style, catching you up into the adventure with pure excitement. I love it!!
Here are some samples (my favorites) from the album. (I hard a hard time choosing, there were so many great ones)