Just beat it. Post-game impressions follow. (no specific spoilers, but I'd hold off if you haven't beat it anyway)
I'm conflicted. Lots to love, but I also had tons of issues with it, and the gameplay loops just hadn't moved on from the first trilogy in the way I'd expected. I had really, really expected them to do something interesting with the platforming. And they didn't. I had really, really expected the game to progress towards more than the classic 'meat grinder' levels. And it didn't. I was expecting all-new enemy types to switch things up. Not there. I thought they'd find something more interesting to do in the more open spaces than 'collect trinkets'. And they didn't. It just wasn't the leap I was expecting other than the 'feel' of controlling Drake and the gunplay, which was much improved. The lack of a moving or interesting soundtrack really hurt it, too.
And I just... didn't like the story that much. I really didn't. It wasn't what I wanted out of an Uncharted game. I mean, the dialogue and acting were incredible. You couldn't fault them one bit. Best in class, best in the industry. But when the gameplay is so, well... 'non-interactive' most of the time and so much of your time is spent watching what might as well be a movie, the story has to fire on all cylinders. And for me, that didn't happen. The tone wasn't what I want out of a game like this, and the seriousness of the personal drama made the classic 'ludo-narrative dissonance' complaint really come to the forefront. I'd talk about all the story stuff more in the spoiler thread, but right now I'm thinking the praise for this game was way over the top.
Rankings right now would be 2>>3>>4>>1. I'm honestly wondering if I preferred Golden Abyss, but I haven't played that one in quite some time, and it was obviously a smaller, less impressive kind of game. But I know I preferred its tone, that's for sure.
And also, is it just me, or did U2 and U3 have far more impressive set-pieces? Or more of them? I don't know, it's been a while. Maybe my memory is playing tricks on me and if I went back to them it would be clear just how much of a leap this one was.
It's very good for what it's trying to be. But I was expecting greatness.