Neir's music is seriously overrated. It's a lot of swoony melodramatic garbage, although the game was half decent. The best soundtracks ever in gaming are not in that list. Sorry for being a biitch I guess lol.
Metal Gear Solid 4 factually has the best OST of the generation, composed by Harry Gregson Williams himself.
Apart from the automatic MGS4 win.. I'd say that Oblivion had an absolutely incredible soundtrack. That song that often comes as the place turns dark.. WOW the atmosphere is one of the best in gaming. My soul is at peace.