Finished it earlier tonight, actually the first FF I've finished all the way through, although I've only played 2 others.
Final time was about 40 hours, found the game very enjoyable if not incredibly uneven. The open world stuff was probably the best in terms of gameplay, and the combat system didn't really wear on me despite it being pretty basic. I loved the look of the world as well, mystical fantasy objects and creatures combined with bits of classic Americana and a dose of anime, its a strange combination that worked surprisingly well. The second half was far more linear and set piece focused, but the story kicked into high gear here.
The four leads were all great in their own right, despite basically being the standard Ninja Turtles personality types, I really liked their friendship. It's true the side characters don't get a lot of depth, and there were times I was kind of confused in terms of lore, and some portions of the game were clearly cut for DLC.
I loved the final chapter though I got so hype when the gang, all grown up,
got all suited up and went into Insomnia to take it back, and I thought the ending was pretty much perfect. I was tearing up during the mid-credits campfire scene.
Glad you enjoyed it! I also particularly enjoy the final fights and final moments of the story. Ardyn is just so good!!!