Almost considerably a 'masterpiece', Kyd's work knows no boundaries, and continues to impress and inspire with a landmark in music composition like this.
The first track is the one to rule them all, but that doesn't mean the other 34 do not live up to the first.
Each track represents the tone and setting of moments and places in the game perfectly, and whilst nowhere near boasts the same credibility and understanding without said visual aid, it may give the listener chills, and provoke thought unlike one would find in music. Soundtracks do that, y'know.
Cannot recommend it enough, although I HIGHLY suggest one plays the game first to get a better understanding of it, other than just listening to samples of it- It is important to grasp what Jesper Kyd was going with when this was made to truly appreciate and understand the whole soundtrack itself.
Or, you could take a risk in deciding for yourself what the soundtrack represents and create your own mindset without compromise of knowing what it was envisioned to represent. Either way, you should not be disappointed.