The (over)reaction to the Daenerys storyline, like the idiot who started the petition demanding to have the series remade, is hilarious to me. Yes, this season (and the last, which was utterly predictable) is a bit on the sloppy side, but it's a lot of crap they have to cram into such a short season so somewhat understandable.
As far as the change in Dany goes, I've seen it coming for a long time, so I wasn't surprised that she went on the rampage like she did. As has been said in here and in private conversations had about the show, she thinks she's entitled to the throne, and that in itself is a serious issue when it comes to her fitness to rule. Not to say that she doesn't have some good qualities or that she's a character I dislike or don't feel sympathy for, but she's gotten so sucked into her own hype that she's become a power-tripping megalomaniac. All the things she's been through, the stories she heard growing up from her sadistic & twisted brother, her family history, the pressure and stress, etc. combined with the "love" and ego boost given to her by her followers for "freeing" them have made her an egotistical, power-hungry, merciless, paranoid, unstable individual who is not fit to rule. A good ruler knows and understands it's about the people you're supposed to be leading and protecting (if you can't serve, you can't lead), but she thinks it's all about her. Even if she started out with good intentions, it was obvious that she wouldn't end up with them. She's been unraveling for a good while now (and a bit off even before that), and if you missed it, you weren't paying attention. I didn't like what she did, but I knew it was coming at some point.
As for theories, even those from the almighty youtubers, lmao, most of them haven't come to pass and most likely never will. I say enjoy the story for what it is, or at least don't take the parts that don't happen the way you want them to so personally. All of the "why?" outrage is silly and pointless. As my daddy always said when someone was crying "Why?" about something that happened on a show, "It was in the script.", so get over it. lol I'm not expecting a happy ending, so I'm not going to get bent out of shape if there isn't one.
At this point though, fuck the iron throne and the seemingly never-ending chain of tyrants who think the world should be kissing their asses just because they have a title. The seven kingdoms would be better off with no one on the throne than they would with another asshole perched upon it.