I've finished God of War Ragnarok now (and gotten the platinum). It's an amazing game, definitely one of the best this year. I don't know if it manages to take GotY title for me, it's pretty even between this and Horizon Forbidden West, but it's up there.
The first game was amazing too, but they've made some improvements here and there in the second game that makes it even better. I had pretty much no problems at all with performance, bugs and glitches during my playthrough. I liked the story, the (new) characters, the new enemies (the variety was alot better than the first game), the improvements to combat and traversal and so on.
If I'm going to be nitpicky about some things I personally wish were better or different it would be de difficulty level of some of the toughest enemies (some of the Berserkers and another "end game" enemy that is just as hard, if not harder) in the game. Just like the first game I think the difficulty level on these are a bit above what you can expect from Normal Difficulty. But this is mainly a personal thing, since I'm not a big fan of extreme difficulty (like the Souls games for example). The aim assist is quite sticky in this one too, not as bad as it was in the first game though. I'm glad they tuned down the grind a bit in this game, even if it's still there, if you wanna do everything and platinum the game. No photo mode on release, but they added it today (I think). But as I said, this is just nitpicky stuff, overall this game is amazing.
Now I will start playing The Callisto Protocol. I hope it's really good too.