The Music for Halo 5 should sound a little more Haloish. Music is One of the main reasons why Halo 2 was so Epic! In Halo 4 im sorry but thier was no Dramatic music. or Any music that Went with you know Chief is about to kick some -Yoink- music.
I thought the music was great. The soundtrack by itself is amazing. The track Arrival during the Midnight mission is builds an epic feeling very well. And all the spots where the track 117 plays.
in all though, the music was more subdued in Halo 4. More in the background. But it fit the tone of the game, which was different than the previous games. The game was more about the chief failing and becoming more human. I think the music fit that theme well.
The franchise is going in a completely different direction, and that means the music should follow that direction too.
The music in Halo 4 was extremely well done imo except that it was way too quiet during the campaign. I can only remember hearing two pieces on my playthrough, when I stepped out, gazing into the huge Forerunner structure on the second mission, and when Arrival played on Midnight.