The visuals, the story, the voice acting, the soundtrack, everything is stunning. Back in 2016, all my friends with PS4 used to talk a lot about this and I didn't understand the hype since I never owned a PlayStation. I get the hype now and every bit of it is justified.

The characters are written quite well and you get sufficient time with each of them in the story. The cut-scenes and animations are so good even for today's standards. This is probably the best application of motion-capture technology in a game I've seen, every facial expression and gesture feels very genuine and more like movie than a video game. The story-telling is quite amazing, you also get to play as a young Nate when he was in the orphanage, which does give a bit of backstory since we haven't played the first 3 games. We also get references to Nate's adventures in the previous games. The story pacing is in just the perfect spot, none of the sections or chapters felt neither rushed nor too slow and you get sufficient time to explore each location.

All the levels and locations are very beautifully crafted and felt mesmerising, I kept going into the photo mode every 5 minutes. The climbing and hanging mechanics are very well done and quite satisfying and enjoyable, especially the grappling hook. When you are hanging onto a thin tree branch over a 1000 feet drop into the thick forest, it really gives a sensation like no other. Sometimes they might seem a little bit unrealistic and breaking some laws of physics but in the end you won't play Uncharted for realism, would you? Even the mini puzzles in the game are fun to solve, sometimes when you're stuck, the characters do give a few hints. The stealth mechanics are quite good for a non-stealth game although I used to get my cover blown all the time even on the easiest difficulty.
Talking about the level design, I felt it's quite straightforward, I never felt like I was lost or stuck. I've noticed this in many Sony games especially in Uncharted and God of War that the levels are designed in such a way that you'll automatically know what is your next objective or where you have to go, without the game explicitly telling you. This is a good way to make sure you also explore the level and that there's no extensive hand-holding by the game which might ruin immersion. Also there's basically no hud in the game except when you switch weapons or open your journal, so it all feels very cinematic while playing.

I've completed Uncharted 4 and only got a total of 7 achievements out of 101, I'll definitely play this (and The Lost Legacy) all over again and on different difficulties and try to explore what I missed.

I would highly recommend getting a controller for this game since it was originally made with that in mind, to me it felt way better to use and more fun than M&K.
It's a real shame the first 3 games aren't available on PC (except emulators which are a pain in the ass). I hope they port the Nathan Drake collection soon since a lot of their games have already been ported.
Also, the optimisation seemed quite great to me since it ran quite well on my potato GTX 1650 laptop.

PS: You also get to play crash bandicoot so that's a plus :)