Just got back from it too. Mixed thoughts, definitely a film with real strengths and some irksome weaknesses.

What really shone: The visual design and animation. Fantastic attention to fine detail in art, architecture, fashion and technology. Great world-building for the major cultures and their ways of life.

Good action pieces, too - lots of practical magic, showing familiar spells at play in the 'real' world instead of a turn-based arena, and a neat blending of magic and modern technology.

Regis, the Chancellor and other major characters got plenty of exposure and were a pleasure to watch.

The actual main cast, though - those unique to the film - were a bit uninspiring. Nyx, purportedly the protagonist, is positively as dull as dishwater. They could've easily made him more unique and compelling. Crowe was neat, but (SPOILER)got sent to the refrigerator to create angst for the guys before we really got to know her.

The film's handling of Lunafreya was disappointing, too. It seemed like she had plenty to contribute, but the other characters were hell-bent on mollycoddling her instead:

"OK, I've got an idea-"
"NO DON'T DO IT YOU'LL BE KILLED"

"Right, I'm gonna go do the thing-"
"NO STOP I MUST PROTECT YOU"

Maybe she'll be less of a doormat in the game, and they just didn't want to give away what she's capable of at this early stage.

Lots of high-quality fan-service in this film, and it was neat to see some classic entities in near-photo-realistic glory:
Oh, and
  • (SPOILER)the Knights of the Round fighting an army of Diamond Weapons.
For an FFVII fanboy or fangirl, that's some price-of-admission trout right there.

In conclusion? I think Kingsglaive bodes well for FFXV, provided the game's heroes turn out to be more complex and engaging, and the supporting cast get more real agency. Hopefully the film just let itself down in that regard to avoid detracting from the game by creating heroes we might miss later on.

There's a brief post-credits scene, so be sure to stick around.