I haven't read the whole thread, I was only just pointed towards this website a few minutes ago, but I wanted to chime in.
To me, the way Sanderson handled the triangle at the end of this book has completely reversed my opinion of not only OB but the entire Stormlight Archive series. That may seem a bit extreme, but the growing relationship between Kal and Shallan was absolutely a huge reason why I kept reading after book 1 in the first place.
Fantasy to me is all about the characters. You can create as much magic and as many Big Bad Evils as you want, but if you don't have the characters there is no reason to read the world you've created. And the way that SA was written to my eyes made it apparent that we were going to get a slow burn relationship between two very interesting main characters. I've even defended Shallan and her potential to other people I know who read the series many times.
But the last 10% of Oathbringer just absolutely shat on that potential and represents a huge backslide in my eyes into a very uninteresting direction. Nothing against Adolin, I think he's a fine side character and very good for what he is, but he's not "protagonist relationship material."
Even worse was the way that Sanderson went about it. Just straight up assassinating Kal and Shallan's relationship in half a page, the absurd justifications for Shallan's feelings for Adolin, and the shotgun marriage. Everything just went down the drain all at once at the end.
Adolin doesn't really get Shallan, he's just nice and understands other people. Which aren't exactly unique characteristics, Kaladin himself is full of those, as are most people in real life. He doesn't have the life experience to match her, unlike Kaladin. I fear that what we're going to get going forward is more awkward justifications that try to ram the characters together regardless of how they fit. And we'll be deprived of the great potential badassery that Kal and Shallan could have gotten up to together.
It's possible that Sanderson is baiting us with this "twist," but at this point I think reversing the triangle would require butchering their characters even more (because of the marriage), or killing off Adolin. Which I *don't* want to happen. Especially not with Maya around now.