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For anyone reading in the future, yes the mixing is dog poo, I agree with the previous comments, but it's not all bad>>
Tracks 36. Fallout, and 59. Good Feather -Fly a Flag-, both have good mixing, and are amazing songs in general.
Fallout, was made for a re-release of this game, so the quality is better, but Good Feather -Fly a Flag- was in the original, it just sounds better than the rest of the soundtrack. I enjoy listening to the majority of the soundtrack, just turn down your volume and try to listen to the melody, since some tracks do have really bad mixing.

If you like those two I recommended, I also recommend checking out these, the quality is definitely lower but they're still pretty fun tracks.
(Also probably turn down your volume)
1. Metal Wolf Chaos Theme I
(Main Theme for the game, the ladder half of this song amazing, I love when the vocals kick in)
9. Pepper
(Very energetic and bouncy, I like it)
10. Metal Fighter
(The guitar is still so good even though it's been distorted so heavily, the vocals are incredible, this song is incredible, I wish I could hear it in higher quality)
23. Good Feather 2
37. Good Feather.
33. Sail
(These three are all different versions of "Good Feather -Fly a Flag-" with slightly worse quality, they're still great though)
44. Boku No Muko
(The quality is really good! And it's strange but relaxing to listen to)
56. I Hate
(The guitar in 1:15 sounds SO incredible oh my god)
58. Smoke
(Typical Kota strange but memorizing melody)

These were my favorites from the soundtrack but there are a lot of other good songs here, so listen to it if you're interested.

(Theory on the inconsistent quality of this soundtrack)
Kota Hoshino does music for most of the Armored Core games, as well as various others, including this one. Before this game, most of the soundtracks done by Kota all sound well made, probably because they were using various electronic instruments and sounds, and not recording anything (apart from Kota's voice for a couple songs). This is the first soundtrack of his to include recorded guitars, so it makes sense that his first time wouldn't be perfect. Two years after this was released, Armored Core 4 came out, and Kota's songs on it sound far better than this, especially the guitars. (Keep in mind I'm only talking about Kota's songs on this soundtrack, not any of the other artists) But this gives us a likely idea of why this soundtrack sounds like that.
8. Smoke

composer in the studio be like "yeah this sounds like dogphooey, drop it"

This soundtrack is such a disaster, a huge mess and a hard chore to go through. Where to even begin.
I listened through the entire thing now and gave me a headache. All the mixes are too loud, distorted and muddy.

The tracks either lack content and are too repetitive or the ones that actually have more layers have actually way too much.
Many tracks sound like they mixed-mashed 3-4 music tracks together into one, well it's because they did pretty much just that.
Sounds like listening 4 radio stations all at once with distortion added to it.

These are not actual original compositions even tho the game production have two linked compositors credited and zero for people who play instruments and who actually made the samples, instead reality is this is a work by someone who doesn't even know what music is so who ever got this job is extremely lucky. It's all just samples and messy stems stripped from other peoples songs and slammed together.

Some tracks sound like they legit added dead noise with distortion on to the track just to be extra toxic.

The tracks that have 'solos' are just someone randomly slamming the keyboard notes and not playing it in a coherent way, there are instances where you can hear a person is hitting 5 keys at once which sounds awful. Imagine a 2-3 year old treating a synth as a toy, that is how the solos sound in this. Once again proof that who ever worked on these have no clue wtf are they doing.

Also the lore and theme of the game is being in USA even tho the music have lots of out of place culture tracks. For example there are few tracks that are 100% Asian, and feels like they are from a completely different game. What does that have to do with with the story I have no clue and at this point not going to dig further to find out bcs no matter what its out of context anyway ...

All in all what might have happened is that these are just suppose to be demos from which an actual composer and producer further gets an idea what to do and expand upon, to make actual new compositions. But for some reason they probably didn't had time and used these demos as final instead.