My initial impression after about 8-9 playing.
Pros:
-Absolutely breathtaking visuals, immensely satisfying the way they've fused the old world with the new. HDR makes it even more gorgeous.
-Great setting, the world is interesting and has many sites, I feared it would be just a vast open space with somewhat lacking content.
-The map is big, like crazy big. I think I've seen about 1/3 of it now and I've been running around everwhere I can.
-Bodily animation is superb, that goes for the robots as well, they move in such a menacing way.
-Sidequests are pretty good, in that they yield decent rewards and don't take five hours each.
-Controls on the ground are top notch.
-Music is fantastic and sets the mood in a great way.
-Trading and crafting system is simple and easy and fits the game really well.
-I have yet to encounter more than one single bug in all my hours, it was when I left my mentor standing on the ledge during the opening, I accidentally pressed circle and rolled forward and off the ledge, dropping a good 100 feet or so, without taking any damage. I have taken damage from falling ever since though. No clipping issues, freezes or quest objective issues that usually plague open world games.
-It runs fantastically well, I haven't seen it skip a beat even once, which is astonishing, this and UC4 are for sure the best games I've ever played in turns of visual quality versus hardware demands.
Cons:
-Combat is way too easy, I think I've killed 99% of my enemies with stealth, the sneaking mechanics are way, way overpowered, especially when you upgrade your armor and reduced movement penalty for stealth. I quite simply don't need to engage the enemies in proper combat most of the time, except the biggest ones, which are very easily defeated with the hugely overpowered roll actions and a bow with neverending arrows. You can aim and shoot your bow and still remain hidden as well, adding to the lack of challenge, especially against humans.
-Camera is a bit finicky in combat, especially if you're in cramped quarters or in a forest, it reminds me of the issues with FFXV, the camera will bounce around and hide Aloy behind trees, rocks, bushes, Donald Trump and anything else that belongs out in the wild. PS: I'm playing on hard.
-Upgrading your gear and getting money is a little bit too easy, I have already maxed out four of my pouches (Resources, Hunter Bow, Precision Bow and Potions) and making even fire arrows is basically free, I'm swimming in crafting materials. Far Cry 3 had the exact same problem and also relied on animal skins and similar components for crafting gear, it's quite simply, well; simple.
-Some of the facial animation is downright scary, child Aloy looks like a bobblehead.
-Some of the writing is really cheap (the exposition monologue in the very beginning was ridiculous) and Aloy has perfect pronunciation at age 6, the characters from the prologue don't age etc.
-AI is really, really poor. Human opponents offer no challenge at all, they can watch their mate being shot in the head by an arrow and then give up the search after 45 seconds, I've also had 5-6 in a row walk up to the same, ever increasing pile of corpses next to the tall grass I'm hiding in, only to get an arrow in the noggin or a spear through the gut. Every single robot I've fought so far uses full-on lunging attacks that are easily dodged and leaves them wide open, those with ranged attacks simply have no aim.
-The dialogue options and sense or morality is on roughly the same level as Mass Effect and Elder Scrolls and your choices don't seem to have any real consequences, this is an area where they should have taken a massive cue from CDProjekt Red, they're the ones to succeed on this so far.
Overall, I really like it, most of the cons are annoyances, like the writing and occassional wonky faces of murky doom, fights against human opponents seems rare and more up to the player, which is good. Sneaking around and whacking robots is still fun even if its easy, I always enjoy playing with stealth in mind in RPG's and shooters. I wish it was a bit more challenging though, usually you get overpowered near the end of open world games, this has you overpowered from the start, especially if you choose the Silent Takedown skill as your first. Overall, though, like I said, I really like it and I'm sure some patches will solve some of the issues. I'm going to play through it a second time on Very Hard or possibly any new difficulty setting they add later on, I think it could be more fun.
I think that Guerrilla have delivered on almost all their promises and they're doing the majority of the things in this game right.