Explaining it without bringing in examples from a hundred and one other things to make my point clear is practically impossible, and I don't like being a windbag anyway so I'll be as breif as I possibly can, but just know that If I didn't want to sound rambly I'd have written a fucking essay.
People like it because other people think it's weird.
Hear me out. Think about a genre of music you think is shit. Could be country, metal, dubstep, doesn't matter. (Well, doesn't matter unless you're one of those lucky walking sphincters that can like any genre of music.) You dislike the unique flavor of that genre, everybody has preferences, the random lines across your brain that make up your thought pattern simply don't respond to that genre in a way that releases the chemicals you need to enjoy that music.
Same thing with Kojima. He has a unique style of presenting narrative and gameplay that is very hit or miss. Just happened to be a miss when it came to you and hit when it came to so many others.
Now as for you pointing out that Death Stranding is getting recognition just because it has Kojimas name on it. Yeah, I don't know what to tell you. It happens. A creator proves himself to be worth his salt to enough people they'll get interested whenever he touches anything. Why do you think so many people went to go see The Hateful Eight? Why do you think so many people are waiting with bated breath for the next ASoIaF? Why am I checking online every month to see if Clutch is gonna release a new album soon?
No matter how many people love the work of an artist, even if they're 99.99% of any given population, there's still gonna be that 0.01%.