I think its a good exercise to compare this show to some other great shows of all time, because, it fucking should be, and be held accountable as to how bad it truly has become. The Wire, which was an HBO show, ran by David Simon, also had multiple characters and story arcs, but they were all organically ended/resolved in a way that allowed the show to end in a somewhat shocking, but ultimately satisfying way.
The bad guy basically won, and yet somehow they managed to make you feel Ok with it. It was a masterful stroke of writing over the course of several seasons that alloed the show to be wrapped up in a tangible way. Thats the real problem with shit writing, its like quicksand, once you get in it, your stuck, and if you dont get out fast, your fucked because you just sink further and further trying to get out of shit you already fucked up.
The minute they killed Ser Barristan in a hallway by randoms in Essos I had a very ominous feeling about the future prospects of the show. I feel like thats when they started to become misguided in the way they handled key characters and started this pattern of head scratching events. The Dorne shit, and all the other garbage that has been railed on over the years created a situation where there was really no way out for them. You cant just suddenly fix bad writing with a couple good episodes/resolutions. It sucks because I had hope that maybe there would be some interesting dynamics this season that would be able to wrap everything up in a satisfying way, but ......this...is not even close to even mediocre, its flat out terrible.