As much as I liked the book up until the 90% mark, the ending fell flat for me and the last time I felt this kind of disappointment I was watching "Indiana Jones and the Kingdom of the Crystal Skull". Maybe you know that feeling: You enjoy something and in the end you are sitting in your chair and you say to yourself "Really? This is supposed to be the ending? They got to be kidding me."
It´s not a bad book and I still recommend it, because there really are some things in it I immensely enjoyed (the world building, the characters, the storytelling). I just don´t think I´m that much of a spiritual person to really like and appreciate the ending.