Apart from the Team Magma/Aqua themes and their associated encounter themes, I am impressed with how the music in the remake has been handled. Mossdeep sounds even more homely as it did in the originals. I am also very much like the Pokemon encounter theme too. The thing that I was worried about was that the music will sound a bit too airy, and I think the Magma/Aqua themes are borderline that, which I think is why I don't really like them. Yes, it's nostalgic, but it just doesn't sound serious enough, especially considering you are facing an evil team. Also, they took too many components out without replacing them with anything. Too many of the countermelodies are missing. I think I prefer the older soundtrack on that one. It sounds a lot more gritty, which paradoxically I think works in particular for that Magma/Aqua theme. What has happened also worries me regards the Maxie/Archie and Steven that their respective soundtracks will be too airy as well.
I understand what people are saying when they say that it has stayed "too faithful to the originals" and that it is too sameish. Perhaps many people were expecting the sort of jump that happened between GSC -> HG/SS Kanto themes which was a very striking example of a completely revamped soundtrack while still staying loosely the same, and that personally is one of my favourites too. So yes, I think GF could've been a bit more adventurous, but that comes with its own risk. If they messed it up, more people would be annoyed than if they kept it almost the same, so that is what I am holding in the back of my mind.
I personally am [one of the few people] itching to hear the Mt Chimney/Seafloor Cavern/Magma/Aqua Hideout theme revamped above all else. The most memorable of all in the originals for me.