I liked the OST for XV but it's more for the relaxing themes. Some of the more grand battle themes do sound good but generic. Which fits into the larger audience they were going for. I think FFXIII had a better OST overall. It definitely had more identity to it.
Also you say modern game music but there are tons of games that came out with great music. Though most have been either from Japan. Most good western composers left the industry or don't get to really do anything creative. It really shows when video game music threads are constantly filled with japanese stuff and most of the western music is from older games.
Older vidya consoles also had their own unique soundboards so they could make sounds that you couldn't make with normal instruments. You'll really notice this with games on both the SNES and Genesis having soundtracks over the same tunes but sounding completely different. 1st webm being a good example.
>All songs in the game aren't in the soundtrack
I fucking loathe that shit. I wonder why things like that even happen.
I listen to those all the time and it really depends on the composer. 2nd webm being a good example with the 3rd webm being something from another popular series.
It has some good music scattered about. I enjoyed The Almighty from P4 and Mitsuru's theme in P4A.