Ending will divide fans

I don't know which camp I will fall into. But let's see. Seems they have done something horrible to one or two major characters and something great for a few other major characters.

This doesn't surprise me at all. GOT's fans are VERY passionate and if it's not exactly what some want then it's going to be met with negativity. I'm sure I'll end up hating the end of it because I've honestly lost interest in a lot of the remaining characters outside of a couple. Also from my experience very few shows I really strongly care about stick a perfect series finale.

That's the root cause. If you care, you want something and are not free to find value in something else. If you don't, you can find beauty anywhere.
Who cares least wins.

"The more people you love, the weaker you are. You'll do things for them that you know you shouldn't do. You'll act the fool to make them happy, to keep them safe. Love no one but your children. On that front, a mother has no choice."
Cersei to Sansa, S2E07.

"People will whisper, they'll make their jokes. Let them. They're all so small, I can't even see them. I only see what matters."
Cersei to Jaime, S4E10.

"Queens must command respect. Kings even more so. Not just for their own sake, but for everyone's.
The High Sparrow has no respect for kings or queens. No respect for anything in this world.
He has no use for the things of this world. He wants to knock them down and replace them with what?
With fantasies. With beggars in the street. With nothing."
Cersei to Tommen, S6E04.

I could have said all this myself. I wonder who wrote it.

There is convincing argumentation that the "Battle of the Bastards" was botched as a result of time constraints. Either the Karstarks or Umbers had a different role to play at the end, as resolution to their ambiguous siding with Ramsay but that part fell off the schedule and was replaced by that longish, nonsensical montage of people fighting in the dirt. It was ambiguous that Karstark sided with Ramsay to help him kill his father (a weakening of House Bolton) and that Umber refused to swear an oath to Ramsay.

Ever wondered how Jon's army, tightly surrounded by spears, was capable of turning into a stampede nearly trampling Jon down? Don't bother, none of that stupid episode makes sense when looked at with a brain instead of an emotion generator.

There were hints of Manderly giving an important speech in the finale (announced in his casting sheet) but that was shortened and replaced with Lyanna Mormont doing the tough little woman shaming grown men, not only for the sake of the stinking feminist stance but because the Karstark and/or Umber turnaround and hence the secret northern move had fallen out of script.

This is the kind of thing they want to avoid in S8.