FFXII's gameplay and the size of each area called for a soundtrack that was not necessarily thematic, but more atmospheric. I agree it isn't completely memorable, but I don't think that's a negative considering the style of the game. The music in FFXII really fits it, and at least it was a good game.
This area of the game and its music were gorgeous, IMO. I need an FFXII HD remake so fucking bad I can't stand it.