Now I'm something like 15 or 20 hours in and I thought I must be near the end. But, I looked and I'm only a third of the way through the game. I can't do another 30-40 hours of this game. So, I'm throwing in the towel.
I really don't know why games feel like they need to be super long to be worth it. I love a good short game these days. They seem to tell a more impactful and less drawn-out story. Firewatch is still in the running for my game of the year and it clocks in at around 3-4 hours for a full playthrough.
So... even though I had fun with the beginning of Uncharted 4 in the end it was just too long of a game without enough variety to keep in interesting for me.