I loved the incredible tension they wove so well into the buildup towards the wildfire explosion that destroyed the sept. Fantastic! As soon as it became obvious the boy was leading him deep underground I realized what was coming and literally slid forward to the edge of my seat. When Margaery's spidey senses began to tingle and she realized something was up, I became torn. I wanted Cersei to fail because I hate her, but I realized I love to hate her and I wanted her to succeed so she'd stay right in the game as a major player. Wiping out all almost all of her enemies in one blow was stunning. I wasn't expecting the king to throw himself out the window. Cersei seemed a bit cold about his passing, but I think she might have felt that she'd already lost him when it became obvious he was completely under the high sparrow's control. I felt a bit of a chill as she walked up to the iron throne to take her place there. The mad queen has risen!
I enjoyed Arya's treatment of Walder Frey, but the vindictive side of me wishes his death would have been just a bit more torturous and slow. She should have drawn it out a bit longer and let him know while he died that no male bearing the name Frey would ever be allowed to live again. That she'd wipe out his legacy completely. That was the thing that mattered to him the most.
It's nice to see Daenerys finally in the water and on the move.
This has been the best season of the show by a wide margin. I can't wait to see what next season has in store.