This game is beautiful, and delivering packages can be very fun and rewarding. I particularly enjoyed building out transportation infrastructure and slowly hoofing it across the map to my objective.
Then... it starts raining and I had to deal with the weird ghost monsters. At this point, the game immediately slams its brakes and becomes a very poor stealth action game. The combat is very poor. Which is fine, except they constantly make you do it. And that is awful.
I made it halfway (about 20-25 hrs) before I stopped playing. All combat sections against any enemies are simply not worth a second of my time. Maybe if you switch to super-easy mode, it can be fine because you will just blaze through those terrible sections.
I wish Kojima Productions had either completely yanked the combat or had put way more time into it. What could have been a great game, ends up being mediocre at best.