Good read. I've yet to get my hands on the soundtrack, but the listening samples uploaded on the review seems to work with my taste. Was there any other tracks that caught your ear?
Regarding the series and from what I've played... I liked Grandia I & III, but for different reasons. The music from Grandia I was just great, I loved listening to the soundtrack in and out of the game. I remember III being pretty fun, minus some frustrating points in the game. I know that I wasn't a fan of the game's soundtrack, so I didn't become as attached to it as I did with the first game. I haven't played enough of Extreme and II to spare any constructive, or any, criticism and praise, so I'll just keep hushed up with that. I don't even plan on finishing the 2nd one, maybe I'll sell it or give it away.
I'd like to see a Grandia IV actually... hopefully with a soundtrack similar to the first CD of Grandia's Soundtrack. Amazing CD.