Characters - Extensive, diverse cast that have massive amounts of character development as the story goes on.
Story - Linear mostly, lots of twists and surprises to keep you intrigued but feels a little drawn out for chapter 4, very enjoyable.
Gameplay - Nice investigation sequences, love the board game style. Reading the critic reviews a lot didn't read the tutorial and tried to skip through and therefore got stuck. (Mostly due to most mainstream critics not liking visual novels and trying to skip through them).
Sound and music is brilliant.
Final thoughts: NIS's attempt at a Danganronpa style game and they've hit it out of the park. 9.5/10 and you get around 32-38 hours of gameplay out of it.
Pros: Characters, story, sound and gameplay
Cons: Pacing a little slow for chapter 4, would have liked a bit of DLC