I'm over halfway through now. It's a good game. I'm liking it better than Rise of the Tomb Raider. There is a lot more emphasis on stealth, which is an improvement over RoTR's heavy emphasis on combat. It's a very dark game visually, and although I had my doubts about that, it's a nice change of pace for Tomb Raider. I'm also playing it differently than RoTR, taking more time to do the challenge tombs and side content. I also appreciate that they give you separate difficulty settings for combat, exploration, and puzzles. I've got puzzle difficulty set to easy, because although I enjoy the puzzles, I don't like getting stuck on them for too long.
I don't have any major complaints, but in terms of negatives, I'd say the story is gobbledygook, although that wasn't a surprise, and the side missions have been hit or miss, a bit glitchy at times.