Come on, dude. This is not rocket science. The entire last season made zero fucking sense. How can Bran become the ruler of King's Landing? He has zero fucking claim to the throne. You had everyone killing each other over who was the rightful heir to the 5 kingdoms, only to have everyone at the end say, "a cripple with zero noble blood is everyone's vote to be king? I'm cool with that." And when Bran returned as the Three Eyed Raven, Sansa told him he was the ruler of Winterfell, and he straight up said, "I can never be the ruler of Winterfell, I can never be the ruler of anything. I'm the Three Eyed Raven." So how the fuck do you go from that statement, to "Of course I'm the king, I knew it all along!" Unless you have full on retards as writers of the show.
Jon Snow was the rightful heir to the throne. Barring him winding up as the king, I would've been cool if Jon Snow would've been killed (although this kind of defeats the point of him being brought back to life), and literally anyone else would've become king, or queen. Hell, put a Lannister on the throne and give everyone their "oh shit!" moment. But what they decided to do was a god damn abortion, and yes, it ruins the entire fucking show, not just the last season. I have zero interest in watching any of the previous seasons now that I know how shittily it ends. The Night King dying from a tiny little dagger from Arya sure as fuck didn't enhance the final season at all. The whole thing was just a giant dumpster fire, and there were literally a thousand other ways you could've taken the story that would've been better then what they shit out.
I still have no idea why they had to end the show in a shortened 6 episode last season anyway. GoT was what was paying the bills for HBO. I actually recently cancelled my subscription to HBO because everything else they've done since has been dog shit, and not worth paying for.