It isn't brought up very often, but I think it's one of those things that can honestly make a game. Powerful music can invoke a wide number of emotions, and having those tied in with the game you're playing can make for both an amazing experience, and long lasting memories. This is evident with a lot of XI's music, as I'm sure a majority the people who played XI can hum more than half of the OST by heart. It was memorable, it had real emotion behind it. All the music was fitting for it's specific region, or the specific battle at hand. Even music from Abyssea (which I never played) is very catchy, so the whole "You just like it because it's nostalgic and you have good memories tied to it" is kind of void.
I guess I personally would just like to know what direction XIV's music is going in. We've heard it slowly change since Yoshida has taken over, but will it continue to change? Will existing tracks be revamped in 2.0 to give us an entirely new OST? Or will music for the current zones / cities remain as is?
I personally think everything could use a revamp. Nobuo might be an amazing composer, but you can really hear he was rushed with pushing out XIV's OST. A lot of it doesn't feel very fitting, which is by no means his fault at all.
...And this is just my personal opinion, but we need less progressive rock / orchestrated pieces, and more classic FF synth. They're trying to bring the "Final Fantasy" into XIV, and that's a great way to do it. Those catchy synths we all know and love. Save the orchestrations for important battles and final cutscenes!