ehh...I don't see how anyone can say this is 'the same' as the last game. It's a very solid evolution of it.
The different ammo types and crafting is a pretty solid addition, instead of just having infinite arrows from retrieval in the first game, the platforming is significantly more involved and less hand-holdy even though THAT part is largely the same in terms of what you can do. Combat is very different with the huge emphasis on crafted/thrown items and more verticality in the areas for heavy stealth or ambush kills, also survival instincts showing you who is 'isolated' in packs of enemies may feel cheesy but it's absolutely necessary to try and ghost a game like this where it feels frustrating and random when you're seen otherwise, so that's a solid touch.
Also, as much as everyone tried to claim hitting X to grab with your pick is a QTE in the 'first 45 minutes of gameplay' last month - I have yet to encounter a single QTE, and I'm about halfway through the game. X to grab onto shit is the closest you get, and that's a legit mechanic in these games anyway (Seeing as you can force it even in unintended areas just by making a poor jump, for example). Significantly less holding up and sometimes jumping, significantly less falling/sliding (twice for the former thusfar, and once for the latter, after 10 hours of gameplay).
More importantly than what is actually CHANGED in terms of mechanics, which is more than you would expect but no, not a ton, the design mentality of this game is shifted so much farther from uncharted style and more towards the parts of the first game that were different, which is awesome. This is so much more about exploration and just playing around in the wide open spaces, the first game HAD that, but it all just led to more salvage or whatever other bullshit you may or may not have cared about - it was just there for completion's sake. Now you get outfits, guns, resources, whatever. All of these things feel valuable, which is a huge difference.
I think all told the first game had pretty significant things that set it apart from Uncharted, but it didn't encourage you to engage with those aspects of the game other than getting a higher percentage on the file select screen, so it led to all of those comparisons. This one just ramps up all of those things - the open aspects of the game, and has significantly less of the 'go go go shoot everything and run away from explosions' kind of bombast that people try to shit talk the game for.