While the music felt a touch out of place, I think that's just because it's different than were used to, rather than it actually being out of place.
Even the stand alone movies we've gotten (rogue one and Solo) have been based on genre films that have big sweeping orchestra pieces in them, so we felt like they had the same kind of music as the trilogies. Rogue one is a world war II spy movie, and Solo is a heist. Both of those genres are commonly filled with big sweeping soundtracks.
But Mandalorian is a Sergio Leone style spaghetti western. The musical scores in those are often unique, and easily recognizable, but they're not big sweeping emotional affairs. Not nearly as often as we're used to getting out of the trilogies at least. They're relatively subdued, almost like a musical version of the background noise of nature.