Played the demo last night. Wife autobought FF zero (holy shit is that game bad) on Amazon for some reason, but it had a code for the demo.
The good:
Seemless open world is nice, though it comes with some heinous load times when you first load a save. Character animations and graphics are really good (PS4 version). Controls are fairly smooth in combat. Audio is fucking amazing in 9-2 surround. Most of the English voice acting is decent in the cut scenes, at least. It has a sort of FF12 open world MMO feel to it, which I really liked when I played 12.
The Bad:
If you go near a quest object, the party dialog is the equivalent of 3 Navis from Zelda bitching at you about the cool thing they see. Combat mechanics are somewhat limited, at least in the demo, especially since you only seem to have control over one character. Weapon switching appears to be bugged, outside of the tutorial fight. The menu system is a mess outside of combat. The night time trash swarms are dumb to fight when all you can see is the small lighted area directly on the ground in front of your guys.
The Ugly:
The Tutorial has this great long explanation of how to do all these impressive timed dodges, counters, and weapon triggered special moves. In reality, you are fighting swarms of dodgy trash that duck anything other than mashing basic attacks -OR- boss monsters that will one punch crunch you if you are anywhere in the same zip code of their attacks. Worse than this, the zerg horde enemy rushes are impossible to fight tactically because this game has some of the worst camera controls and movement of any game I have played in years. Like, Spyro the Dragon on PS1 levels of bad camera. The twitchy target lock and inconsistent camera panning make anything resembling tactical combat basically impossible. Worse still, during boss fights, the camera likes to stay more or less on the boss monster, which would not be terrible except it means you cannot see where you are going when running for your life to avoid getting turned into road kill by its basic attacks. Last, its one of those "main character gets KOed Game Over" games, which essentially translates into "main character fails a dodge against boss, gratz 4 minute load screen" aggravation situation.
Bottom line, I think the camera issues can be fixed. They need to be corrected for the game to be playable. The other stuff should be fixed, but unless they trade out zerg hordes for fewer enemies with more HP, its just going to be a DMC clone where you have all these amazing special abilities you never use because mashing autoattack is the your one viable option. I hope they fix the issues, because there is a good potential to wipe the stink of 13 off of the franchise here, but I will never understand why Squeenix seems obsessed with making an action game when their turned based RPGs are what built the company into greatness.