was thinking here... I think it's a good marketing move to release Kingsglaive before FFXV, because you still don't don't know much about FFXV you watch with a more open mind like say, Advent Children, which almost every fan had a deep emotional connection with the original when the movie released and consequently, higher standards.
additional impressions:
http://gematsu.com/2016/08/first-12-minutes-kingsglaive-final-fantasy-xv
"Am i the only one who already watch the movie in theatre? Overall not impressed with the story, cgi is top notch.. 1st time watching, the eng dub was not that good with the character.. 2nd time watching, if focus on the voice rather than cgi, it was pretty good actually.. i give 6.5/10.. the story not that strong for me."
"Saw it today at the theatre (I live in Singapore btw). I was honestly surprised by how much I liked the movie.
The first 15-20 minutes are a bit convulted and too heavy on cliche voice acting (I lost count how many times the word 'hero' is said), but after the intro the real plot gets going and it actually kept me hooked all the way through. I loved the political intrigue and was shocked by how dark and gritty the movie actually is.
Besides the first 15 mins and another 10 mins in the last third (where I don't know what the hell is going on) I found the movie pretty solid. The voice acting of the main characters is top notch and the visuals are truly unbelievable.
I definitely recommend it even for non-FF fans."