I didn't get what people were bitching about when it came to radiation, but once nighttime hit in the game, radiation was generally much harder to notice, and that could be frustrating.
I just beat the game, and the ending is definitely disappointing. My overall impressions are still somewhat positive, but I have a lot of reservations. The game is fairly short. The way collectibles are handled is atrocious. The story was a terrible, cliche ridden mess that took itself far too seriously. The gunplay isn't the game's focus, but it's kind of weak. And many of the game's artificial barriers, radiation most specifically, can feel very arbitrary.
Despite that, I definitely enjoyed my time with it. The swing mechanic is incredibly strong, and it makes navigating the world a joy. Your arm also makes fighting foes fun, and you have plenty of options to dispose of them without even picking up a gun. The challenge system wasn't quite as exhaustive as I would have liked, but it still encouraged the player to explore different weapons.
I could see myself replaying this game again, and that's more than I can say for most titles, so it's definitely pretty solid. Still, it has a lot of flaws, and they betray the beauty of the base mechanic.