I too have played Final Fantasy XV and boy, let me tell you, it is a game. Not like how some games are games and other games are all, "I'm a game, play me!" but this game is a game's game. First, the narrative structure. There are chapters and they all link together to make the game. Some people may suggest that the chapters are too long or too short, but I think they are a length that is becoming of chapters. The plot is doled out in very discrete or perhaps slurred pieces, which makes for a very interesting story perspective. Players who play this game will surely agree. Next is the gameplay, which was clearly designed from the groundup to be for players. You might notice there is a change in gameplay about partially through the game. While the merits of this are debatable, it is clearly in the interest of creating debate. I think players will be talking about this for years to come.
The graphics are great, with detailed pixels, lighting, and polygons. I will say you may notice some imperfections, such as. Generally speaking, Yoko Shimomura composes the music and she has created a soundscape.
Overall I think you will be left feeling things after you finish FFXV.