I just listened to most of what's available of the soundtrack on YouTube, and I have to say that this soundtrack is considerably more hit-or-miss with me than the nearly flawless brilliance that was Generation V's soundtrack was. I dislike that there do not appear to be individualized Gym themes, as I thought that was one of B2W2's best implementations. I also miss the "Gym Leader's Last Pokémon"-style theme, which, in my opinion, always added a lot of tension and grandeur to the Gym Leader matches, but since the awful, momentum-slaughtering "Low Health Theme" is also gone, I suppose I could say that the matter has been equalized, and I can live with that. Additionally, I am trying to be a bit more lenient with this soundtrack since it was their first time doing a fully-orchestrated soundtrack for the main series games and as such, may not have found their footing yet. But with that being said, there are a number of successes, and I can only see it getting better from here.
The tracks that I am particularly fond of are:
-Xerneas/Yveltal Battle Theme
-Team Flare Grunt/Boss Battle Themes (Although it took me a little while to... warm up... to this one. I will not apologize.)
-Champion Battle Theme
-Wild Pokémon Battle Theme
-Snowbelle City Theme
-Anistar City Theme
-Geosenge Town Theme
-Shalour City Theme
-Victory Road Theme
-Power Plant Theme
-Santalune Forest Theme
-Route 1 Theme
-Route 19 Theme
-Professor Sycamore Encounter Theme
-Bike Theme (SOOO much better than Gen V's... that was one of the very few Gen V tracks that I absolutely hated.)
The tracks that I am not very keen on are:
-Gym Leader Battle Theme
-Elite Four Battle Theme
-Korrina (Non-Gym) Battle Theme
-Camphrier Town Theme
-Santalune City Theme
-Vaniville Town Theme
-Gym Theme
-Cave Theme
-Route 2 Theme
-Professor Sycamore Lab Theme
And I'm torn on Lumiose City theme. On one hand, it's a perfectly fine theme, but on the other, I could easily see it becoming very annoying, especially considering how big Lumiose City is.