I don’t think there’s any areas I can really think of- most of the atmosphere is done really well, especially music.
Boralus fits well, I just think you don’t like how bombastic the theme is, but it really fits for a naval city.
Can’t forget it was the (old) Alliance’s main maritime base for a long time.
Dazar’alor for the Horde is their equivalent, and both cities have pretty over-the-top music, in a good way though.
I think it’s more your taste that you don’t like it lol, but I do think it matches quite well.