Please don't understand this as insult to your esthetics, but yeah, that's exactly what I'd call bland. Layering string section and exposing folk-inspired motif is what composers do when they're uninspired and on deadline.
I should have mentioned Neverhood of course. Its OST is always in my playlist :) Terry Scott Taylor is great. Armikrog is coming out next month by the way.
Anyway, I find Witcher soundtrack to be pretty good. Sure, it's not extra unusual if you compare it to good folk music. But I don't see why one has to make a point of making the music extra unusual for the sake of it. The music should set the mood, and it does it perfectly in the Witcher games.
From more musical games, inXile's satirical The Bard's Tale has fun songs:
To stress the point - that music set the mood so perfectly (it should be combined with ambient whispers to get the same effect as in the game). That's the main purpose, and whether on its own it's super innovative or not is really pretty secondary to me.
Here's just a random sample of what I've enjoyed:
https://www.youtube.com/watch?v=Wh4WnHlsbvM Neverhood
https://www.youtube.com/watch?v=SV6ZjYYCavg Clock Tower
https://www.youtube.com/watch?v=AnMR6SOBa9k Diablo
https://www.youtube.com/watch?v=9lQTbRY2xWY HoMM3
https://www.youtube.com/watch?v=E5g-QHq925o Streets of Rage 2
https://www.youtube.com/watch?v=ftvpi-6Z6qw Arcanum
https://www.youtube.com/watch?v=yp7PYi5b8jg Chrono Trigger
Tristram song still sends chills down my spine and full moon over me right now isn't helping.