Don't you see the emperors body strung up with Luna, Nyx and Regis at the end of chapter 14? I did not think he was that daemon at all.
Honestly up until you went to Altissia in the game I was pretty positive, could easily have seen myself given this a 9/10 at least. Then Luna died and the entire story went to crap. Everything after that was terrible, not to mention chapter 13 was probably one of the most frustrating parts of a game in recent memory (slow movement speed and all those key cards).
How they made a game with so much dialogue and cutscenes but failed to flesh out any of the characters is beyond me, when Luna died I didn't even react as she'd never interacted with the group at all. She had almost no character development. Then you're led to believe that her and Noctis were in love or something? Even tho they hadn't seen each other since they were tiny. I'm honestly getting serious MGSV vibes from this game. It seems like they got up to making Altissia and some big-wig from SE knocked on the door and said the game has to release in 6 months. So they just cobbled together a half assed second half of the game.
Also the World of Ruin should of been expanded on immensely, being stuck in Hammerhead was a joke. No older Cidney? Iris? Cid in a wheelchair? Being able to explore and see how the world had changed would of saved the ending....a little bit at least.
I'd give it a 7/10, which is disappointing for a game I waited so long for. It's better then XIII, but that's as much praise as I can give it.