for me (I know it was earlier for most), was season 7, episode 6, Beyond the Wall. The quality had already been dropping obviously, which was to be expected given they ran out of source and you couldn't expect Dumb and Dumber to write as good as GRRM. But, nothing imo had been just completely ridiculous as S7 EP6.

Let's think about this for a minute (long post incoming). Just the plan in general was completely idiotic. Why in the world would they think that Cersei would even remotely care about the army of the dead/the Night King? There was zero chance she was ever going to help out and if anything, seeing one would make her happy that they were marching on Winterfell. So a handful of guys risk everything to go up against thousands upon thousands of wights and white walkers just for the chance to possibly capture one and bring it back to Cersei, what a brilliant plan. I guess the army of the dead will stop marching on the wall while they make their little trip to Kings Landing.

Then good old Gendry, who can run 80 MPH without a breather, makes it back to the wall and passes the torch to a raven that can fly 400 MPH, he passes the torch to Dany. All of this in a span of a few hours. Meanwhile the army of the dead are completely content just waiting there (while at the Battle of Winterfell they are literally throwing themselves on fire so they can get over the traps). The Hound (whom I love) decides to be the biggest idiot ever and throw a rock at them, because that'll really show em, and he let's them know the pond is iced over.

So Dany comes to save the day and they are making a perfectly fine get away on the dragon, but Jon inexplicably decides that he doesn't need to get on the dragon and get away but wants to be a hero and kill just a few more inconsequential wights that would have made no difference at all. If he would have just got on with everyone else, they could have presumably flown away safely. But no, he stalls Dany/everyone to kill a few more so in the mean time the Knight King can ice javelin a dragon down and give him the dragon they need to get past the wall.

Almost every other option out there was a better plan that what they did. 1) Fly to Kings Landing, burn up Cersei/take the throne and use your new army to help fight the dead. 2) Let the army of the dead march on the wall and fight them there and burn up the army. 3) Just let Jon and company die out there and live to fight another day but just with 6-7 less men. Your useless mission handed them the only thing that could let them get passed the wall.

Every single detail of that episode made no sense. Even wasting Benjen coming back. He for some reason can't put Jon on his horse and ride him back to the wall, there's no time for that. More important was him killing a few wights so a half dead/freezing Jon can I guess now walk back faster and get away from the army.

Long read I know. But on the re-watch (which I swore I never would do), I was actually not bothered by as much as I remember. Outside of the ridiculous Dorne plot and all of Dorne being ok with Ellaria Sand killing Doran Martell and Areo Hotah because Doran didn't do anything over Oberyns "murder". He wasn't murdered you idiot, he chose to be in a fight to the death match and he lost fair and square. That sucked, but that was his choice and he cost himself his life by being arrogant. Even with an insignificant character over throwing the leader of Dorne can be excused because we got the glorious boobs of Tyene Sand and "bad poosy"

Ok ok I'm done. I will defend the Battle of Winterfell though, I'm sorry, that was a bad arse battle outside of completely wasting her Khalasar on a dumb charge into the night. It was a gritty, dirty, smokey battle and needed to be dark. Jon should have had a showdown with the Night King but Arya was my favorite character in the books and the show so I didn't have a problem with her killing the Night King as most did.

I won't go intot he ending of the show, which I could write an essay on.