So I finally beat it !
Well... Some good thing and quite some bad thing for me.
From a Final Fantasy it has the world, lore and story. But on the gameplay part, they remove almost everything.
No RPG elements (no passive abilities on weapons or armor so no real choice), no elemental weakness/resistance (what the point of "changing your magick essence" when changing Eikons abilities ?), no secret/mysterious sidequest, no minigames, no Biggs and Wedge (?!, they're somehow there at the beginning but not named like that xD)...
It's pretty much a onrail action game (nothing bad about this but for a FF I am not a fan) with stunning visuals on cutscenes. But it has big pacing issue. Each time the story reach a peak (Eikons battle usually), the following hours are sidequests disguised as "main quest".
The game would have gain to be more condensed. Toward the end I stopped doing sidequests because they take too much time and are not interesting to do evenso they contribute quite a bit to the world building. For the majority of the game there was always 3-4 to do at the same time but suddenly there was dozen of them to do, it just broke me.
Combat system is nice and I am not a defender of "FF should be turn based" but on the long run it becomes really repetitive and really shallow. Boss (and notably the hunts) are too spongy. I just couldn't stand them toward the end. They are not challenging, just spongy. I still timed my dodge and counter abilities but honestly not too much point to do so...
Also visuals and particles effects... It's pretty nice to look at and for the most part I was amazed till on some the the late games battles it becomes overkill... It made the action to be really difficult to read on some battles.
I liked the story but all the cons of the game made me less involved into it. I think the ending could have get me emotional if I was not so tired of all the other game aspect...
Side note : I also played it in a particular personal situation so it might have affect my appreciation of the game. I might replay it in few years.