Guild wars has an insane soundtrack composed by Jeremy Soule , I bought all the CDs and listen often to them. The landscapes are beautiful and realistic, especially when dealing with dark places, those are really frightening and it really impresses you. But unfortunatly the game kind of died... And then there was Aion which I did not try but it must really be a good game, the soundtrack isn't as good but it's ok, and FAIK the graphics are even better than GW.
What really irritates me is those composers releasing the soundtracks in mp3 only !! I seem to be the only who actually cares having this kind of music in CD quality...