I sometimes find it difficult to rate individual episodes because, until the last couple of series, there were only a few ones that focused on a single storyline. I used to think I liked Series 6, but, looking back, I think that opinion was shaped largely by the last episode. "Battle of the Bastards" was entertaining, although it seemed to mark the point at which spectacular setpieces that could only occur because of the characters' stupidity became standard practice.
Really, I think that's the worst thing about the later series. The story used to hinge on the consequences of the characters' actions, and how the biggest events were shaped by the decisions they made over the course of the previous scenes.
Later on, it seemed that the writers dreamed up some action scenes without any serious notion of how to get there, so they just made previously intelligent characters come up with ridiculous plans for the purposes of Hollywood-style entertainment. One example would be having the Dothraki charge into the darkness to their deaths. It was a really memorable visual, but it was a completely idiotic military strategy. Then the Dothraki were back two episodes later anyway, so it didn't end up mattering. Of course, you've also got the infamous "Dany kinda forgot about the Iron Fleet" scene.
The thing I remember most about that scene was Jaime saying that he never cared for the common people of Kings Landing, "innocent or otherwise". That's a rather strange statement to make from someone who forever sullied his reputation to save many of those very same people.