Tbh, they were contained by time. They could've made the ending work, but the pacing was jarring.
Spoiler: In season 8 a major and important character repeats one line which is ‘she’s my queen’
I would say the first 6 seasons are perfect TV, even the "slow" episodes are well directed. But the last 2 seasons felt like the heart and soul was taken out and replaced with cliché surprise and plot twists for the sake of there being a surprise or plot twist.
I personally think, the Dothraki charge into the darkness aside, the final season was good. I think 90% of the hate is that every fan theory was wrong and they cannot stand it. They cannot stand lack of 3 dragon riders, the fate of Khaleesi or the demise of the White Walkers. And that is what makes them such toxic reviewers. Yes the makers may have rushed it a bit but they didn't have books to work from.
...so you wanted see things that GRRM will not write in his final volumes? Got it. He has already confirmed his final writings will be almost a perfect match for the final 2 seasons. Walkers making it to Kings Landing. Good one.