It placed quite a lot of emphasis on intimate two-hander scenes that really got the message across. Power is power, and it's going to rip our friends apart. As Tyrion says to Davos, "We may have defeated [the dead], but we still have us to contend with." As an audience member I felt genuinely heartbroken by what took place in front of my eyes just there. This show has always displayed how evil works and how merciless it is, but when we had honourable people up against tyrants we could still stomach it to a degree because we could pick sides. We supported Ned against Cersei and it hurt when he lost, we supported Tyrion against Tywin and it was amazing when he won, we supported Robb against the Lannisters and it hurt when he lost, we supported Sansa against Ramsay and it felt amazing when she won. The evil characters were tempted by the lust of power and some of them eventually paid for it.
But now it's harder to accept because the dynamic has shifted. Power has started to poison the minds of people we love and it's tearing their relationships apart. We've always been pro-Daenerys but it turns out she couldn't beat the ghosts of her father's nature after all. We wanted Jaime to leave Cersei behind and be happy and healthy with Brienne, but he can't shake his demons and feels he isn't worthy of her. This season, we've wanted Daenerys to let Sansa rule the North independently, but absolute power is too tempting for her. Cersei has finally caused Daenerys to snap, and she's going to go Mad Queen. If she was going to go Mad Queen and only destroy Cersei then we could withstand the prospect a little easier, but as evidenced by poor Missandei and Rhaegal, Daenerys' quest for power is going to get everyone killed.
Quite a lot of characters feel marked for death in a way that they didn't last week. Daenerys surely won't survive going this power mad, Jaime has ridden to his doom with Cersei, Tyrion and Varys have committed treason simply by discussing alternative rulers and aren't safe if Dany finds out. And what the fuck is Jon going to make of this when he arrives at King's Landing to see Drogon torching innocent civilians? Is he just going to stand idly by and keep himself safe? If this is the bittersweet ending the showrunners promised then I think we're looking at about 90% bitter and 10% sweet, and I'm honestly here for it.
This show was always at its best when it analysed the brutal, evil nature of power, and how it can destroy everything underneath it - this episode was all about that.