I can't speak for MGS, since I've never touched that franchise. P.T. was my entry point for Kojima, and then Death Stranding.
I definitely get those complaints about Death Stranding's gameplay, though for me, I found myself captivated by the expansive emptiness of its world and the way the rolling environments dictated the particulars of the movement mechanics and in the ~40 hours it took me to complete the game, I never felt it losing steam or grating on me. In fact, the itch to replay has been steadily increasing lately. And the story was very much my shit.