Alright so I just finished playing for the day I clocked in about 8 1/2 hours here are my impressions thus far.
Characters
I think the main cast is really well done. I really, really enjoy Prompto his VA did a perfect job and he's just overall hilarious and really likable. Gladio and Ignis' English voices don't annoy me anymore but they aren't the best. I think Noctis' voice is good for the most part but when he tries to be emotional it sometimes falls flat. I think a lot of the voice issues have to do with the fact they weren't together recording the lines but then the lines were put together to make it seem like a conversation. Overall, I've really enjoyed my time with the guys and just hearing them talk about random stuff.
Combat
I really, really, really enjoy the combat in this game. It's probably my favorite combat system in the series to date. It is just really run once you get the hang of it. You have so many tactical options as Noctis and the AI for your buddies is surprisingly very competent. Mobs are plentiful (unlike the Judgement demo) and pressing square to win is really not an option. To be successful knowing when to defend is critical (and not just when the parry prompt appears either!). One thing I do dislike is there is no dedicated cure spell for Noctis (I have yet to find it if there is one) but Ignis does have a technique that remedies this issue to a degree. Magic is an interesting system that promotes a lot of trial and error in coming up with the best magic combinations. Overall I'm having a great time with the combat
World Building
There are some really awesome touches they have incorporated to make you really get a sense of the world in FF XV. One of my favorites is listening to radios in random places (ie on the counter in shops) and hearing about the goings on in the world. The monsters fit seamlessly into the world and really feel like they belong there. That is not to say some stupid aspects are stupid (specifically something that is said about currency early on) and nonsensical.
Story
The biggest disappointment so far has definitely been the (lack of) story. I am only in Chapter 3 but the fact that you have to wait until the beginning of Chapter 3 to get a first glimpse of the majority of antagonists is problematic. They also lack an introduction for said antagonists. If you did not watch Kingsglaive you will be extremely confused. Finding out about the what happened in Insomnia also fell completely flat and the fact that other characters seemingly have nobody in the city they are worried about is just odd. I can see why some people have said characters > story in this game because the character building up to this point has been excellent the story building has been pretty shitty. I really advise everyone to watch Kingsglaive so you have a better grasp on the story because it isn't explained well at all if you lack that background knowledge.
I think that's it for now. I'm having a really good time playing this thus far.