That’s cos it wasn’t that great, DG.
It’s random. Some songs are good, more often than not they’re bad though. I even found out why upon reading the soundtrack review at RPGFan:
“The technical crafsmanship of the orchestral writing and lucidity of compositional thought is impeccable, but the disc lacks Hamauzu’s customary inventiveness and searching originality. Turns out a number of tracks on this disc were written several years ago and rescued from the bottom of the drawer, which creates the illusion of a minor regression of style, with many of Hamauzu’s characteristic phrases and progressions on display in incipient form.”
All I can say is: It’s obvious 
Wow… still… I’ll still appreaciate the OST anyways