I just finished it, I can finally hang out in this thread! I don't think it's as awful as has been implied but not the greatest game I've played either. Better than XII and XIII at least, so that's something.

Positive
I agree with everyone that the bro-bond and the Ignis blinding were the strongest bits storywise. That was a really difficult dilemma but it was also a great way to have an escort character in a game you don't feel pissed off with. I was also really worried about poor Prompto! I know some people aren't fans of the photo taking gimmick but I unreservedly love it, and was really thrilled to see a montage of the ones I'd taken to Stand By Me in the ending. The ending itself was neat enough too.

A few more quick points:
  • Ardyn was also a delightful and thrilling villain.
  • World design - Altissia especially - was smurfing gorgeous.
  • The big set pieces were great - eg the Leviathan battle or the train warping battle. They were great changes of pace!

Negative
I totally agree with Fox that more explanation of what the smurf was going on was necessary. It's a fantasy world with new concepts, explain them to me a bit more, I'm okay with it! I genuinely had no idea where I was going or why half the time and just went along with it. I also agree that Luna's death had very little impact at all. I thought she wasn't dead at all because of how wishy washy it was, and the radio and some NPCs said they were still searching for her so I thought she'd pop back up again.

I also absolutely loathed Chapter 13 - Noctis on his own in the imperial base. Ugly and sameish level designs, irritating backtracking puzzles, weird game mechanics thrust on you out of nowhere, no other characters to interact with and overstayed its welcome waaaaay too long. Lowest point of the game for me.