To join the pile-on as someone who has read the books and was a big fan of the show, I also have no desire to re-watch due to the last season. I think people's complaints can be put into two broad categories:
Sloppiness, unbelievability : Surrounded characters surviving off camera, teleporting Varys, Jaime and the river/lake fall into this category. These annoy me but I can roll my eyes and overlook them for the most part. There were definitely a lot more of them in the last season compared to earlier ones, though, so I can see why it annoys people.
Big events that didn't have the right build-up/explanation. This is where my main beef is. Unlike a lot of people, I don't take much issue with Danaery's turn, because I think there was at least enough background to make it semi-plausible. Of course, Dany always kind of annoyed me, so maybe I'm biased. To me the big ones are:
- Night King's end. I'm fine with Arya not Jon doing the deed, and maybe even in the manner it happened if it was properly explained. But it wasn't. Unstoppable undead force meets sneaky dagger and poof. I know some fans put forth the theory that the exact heart tree that it happened at is the only place that he could be killed and Bran had to lure him there. I guess that works as an explanation, but there's no evidence in the show that he couldn't have been stabbed anywhere else by anybody else. Just send 100 Dothraki at him at one time and be done with it.
- King Bran. Show Bran basically did nothing. Why in the world would anybody agree with this? Why would Dorne and Pyke go along with this when they have been rebelling forever? "Okay, different random ruler is fine, we don't want to be our own kingdom anymore because the dwarf said so."
- Jaime going back to Cersei. Like the previous two entries, you could come up with a plausible way this happens, but we sure weren't shown it. All of the sudden he's like "actually I suck, and I don't like you anymore". Umm, okay then.
It seems to me that they had a broad outline, but didn't have either the talent or desire to actually get the show there. I hope if we get the books it makes more sense.