Right now my biggest issue is with the games "dungeons". There aren't all that many, which is a minor quibble (especially when the field is as gorgeous as it is), but what's much worse is the quality of them. Sure, they're as beautiful as the field, but not only do you get the maps for them as soon as you walk in, but they are all extremely straight forward and linear - even the ones that have switches that nominally change the shape of the dungeon make it so you can only hit the switch once, making it more "hit switch, follow only path available, hit switch, follow only open path, etc" til you get to the end.
A secondary quibble is that the narrative just isn't that good, IMO. I'll try to be as vague as possible to avoid spoilers herw. I did have a major event happen last night, but before that and after a decent first 10 or so hours, the next 20-30 hours of the game are "wander to here, solve this towns problems" without a lot of connection to the games' larger story. A lot of the vignettes are decent enough on their own, but put together it makes your character feel like a personality-less errand boy - to an extent even greater than other RPG's with silent protaginists. They also go to a certain plot device that I won't spoil at least one too many times in the mid-game.
There'a a few other minor quibbles, but that's probably the two major things that have been bugging me. The dungeons in particular - I can't believe they both made them so simple and immediately give you a completed map the second you wander in.
EDIT: I said earlier it probably wouldn't make my top 3 JRPG's for the console. I understand that there's a large gap for traditional AAA turn-based RPG's in the market, and in that subsection, it probably is the best on PS4 (what's it's competition, World of Final Fantasy?). But I have a hard time saying it's objectively a better game than Ni No Kuni 2 or even I Am Setsuna (which is turn based but not AAA), much less the jewel of this generation, Persona 5 (which yes, is turned based, but is also half social simulator and takes place in a realistic setting, so I can see not calling it a traditional turn-based RPG, I guess).
I think it's probably better than the two Tales games and the Star Ocean game this generation though, which were decidedly average.