I'm a bit biased, but I like the music so it doesn't grate or get old with me.
I agree the chase scene had inappropriate music, but it often hits you in the feels (or maybe that's just me) for example when you get to Dundrasil. Using DQIV's battle music at one point was genius and a nice throwback (which the game is full off, even the smallest thing can be a throwback).
I'm sure there was an interview during the development where it was said DQXI would have a lot of new music, which didn't really turn out to be true, not sure if the translation was wrong or I'm misremembering though, and I'm too lazy to look it up. But that's the most disappointing thing, I would of liked a bit more variety and more new songs.
The game was developed as a love letter to previous games in the series and such stuck a lot to the roots, which meant no voice acting and MIDI (although I was under the impression it was synthesised) as the series isn't really known for those, voice acting was originally added to DQVIII's localised version to appeal to Western markets more and then added to the Japanese remake, maybe because they planned to bring out the localised version overseas so they added it. The 3DS remakes are kind of the exceptions as they had orchestrated music which was removed for the localised version for reasons that aren't really clear but the general consensus is Sugiyama blocked it. In case of DQXI, at least both versions have parity.
I think DQVIII may have set people's expectation too high, but saying the music is bad is overly exaggerated and in some people's complaints is bordering on entitlement. I think it's funny that the "but the developers original intent" argument is conveniently not even brought up in cases like this. The orachtrated music is much better than what's used in the game, there's no denying that, but we got what we got and at worst it's just "fine". Maybe the Switch version will use the orchestrated soundtrack.
Also Square Enix keeps complaining about sales in the west but they never market the games enough or they take too long in getting the games out. You would think they would have taken notes from DQIX doing well because Nintendo actually pushed it, even if it did market it as a dress up game.