This game has always been really controversial among action fans, but I personally really appreciate it and I think it deserves the critical acclaim. It's not my GOTY 2018, that would be Yakuza 6, but still.
I think that the combat system is overall really good considered that there is less emphasis on it than older GoW games. It's not revolutionary or complex, but it works well and you can do some fun stuff with it, as you can see on YT. Among recent western AAA titles such as The Witcher 3, Horizon Zero Dawn or AC Origins, GoW has EASILY the best combat of the bunch imo. I liked the level design too, and I'm glad it's not another empty open world game with tons of fetch quests. The setting is interesting as well, I hope that it will be explored more with the second entry.
There are, however, things I don't like and that prevent this game from being more than "just" a really solid game:
- they could have done more with the bosses, there are only like 5 real bossfights in an action game that lasts more than 20 hours
- the post-game stuff is not interesting enough imo, the valkyries are not particularly fun to fight and the discount chalice dungeons are just dull (even more than the original CDs from BB, which were already the worst part of the game)
- the hardest difficulty mode is basically "hit things a million times while they one-shot you" and doesn't add anything new
- the boat segments get boring really fast
Overall I don't think that this is a masterpiece or the game of the generation, far from it, but it's an awesome way to reboot a series and a very solid foundation for future games. As of now, the best game in the GoW series is definitely 3, in my opinion.