Nadine fight 2 worked because she finally reappears, but gameplay-wise there was very little there. Might as well have been a QTE since you couldn't change anything and there wasn't even any firefight in that chapter. Not to mention that it just leads into chapter 16 lol.
Sam's rescue wasn't as well executed as it should've been. Chapter 20's ship graveyard was awesome, but then there is a huge cool down with nothing but platforming at the end of that chapter and for the entirety of chapter 21. A small cooldown was needed, but Chapter 21 was essentially useless.
Madagascar Sam chase was great. Arguably the highlight of the game, but there should've been a nice firefight after the setpiece with such a long cooldown looming in chapter 12 onwards. They jumped straight to the boat though smh
Nadine fight 1 sequence was okay. I felt they could've done more there though. The fight itself was not interesting outside of Nate meeting her. Fight system needed a parry mechanic during those forced 1v1s. Also, part of it was really a stealth tutorial. The bit at the end was good though.
Prison escape was fun, but didn't present any real challenge to the player due to how scripted it was.
The best climax after Chapter 20 was Scottland escape. I actually really loved that part.
Volcano was a huge missed opportunity too