But on the contrary some games have adaptive music, and interestingly it’s a bit more like John Williams’ view on movie soundtracks : it’s made to adapt to what’s happening in real time. When it’s done right it’s everything but boring.

Elite: Dangerous does this extremely well (IMO it has some of the best sound designs out there, not only music but everything else, too, including the dynamic range). The music is never this generic bombastic horn sections, and it's different in different environments and situations, always somberly haunting at the edge of consciousness and enhancing, not overpowering, the gameplay.

Yeah hard disagree with Nobuo on this one. I remember firing up Halo CE for the first time and being blown away by what I was hearing throughout the game, and to this day I can see a screenshot of that game and my brain immediately starts rocking out to that level's sound track.

It can be utilized poorly for sure, but a videogame with a cinematic sound track done right goes straight to my favorites.

Completely agree. A movie style soundtrack has it's place if used correctly.