That's what it's mean to do (reduces resolution near edges).
Edit: It's probably most useful for downsampling / 1440p / 4K.
Nope, you can still see reduced resolution near edges in 1440p unfortunately.
As for the game itself... so far it feels like a mix of Borderlands, Diablo 2 and Shadow Warrior (reboot). I don't like Borderlands at all in terms of gameplay and bullet sponge enemies, but I really like Diablo 2 and I really like the aspect of upgrading weapons in Shadow Warrior 2 plus it doesn't look like there's billions upon billions of guns or other weapons in this game like in Borderlands and enemies is not that hard to beat even on hard so overall... I like this game.
The story and cut-scenes though... well, it's not my thing pesonaly and it's not even funny (or maybe I just don't understand the humor), but hey, who cares about the story and cut-scenes in Shadow Warrior games anyway (?), I mean, clearly It's not what these games is all about, plus the gameplay is really fun, meaty and with a shit ton of gore.
But here's the thing, I still like DOOM a lot more than Shadow Warrior 2 cuz it's just... well, a lot better and way more satisfying FPS for me. But it doesn't mean that Shadow Warrior 2 is not good, no, it's really good, just... not at a good as DOOM. Damn, I don't even know if there will be better FPS than DOOM, it is very hard game to beat imo.