I am with you in that I think more twists and turns are better. Don't get me wrong on that, and I wish that there would have been more intrigue and suspense in some respect with the last episode (like for instance, maybe Jon Snow sacrifices himself to save Dany or something like that). But this statement you are making contradicts itself...you don't like this episode because it was not done like GoT (e.g., we were told something, we got it, and it was recapped) but you want a backstory where we are told about their flaw and it is later exploiterd or something like that? Isn't that what happened, but instead of doing it by way of a flashback it is just done in real time. Also, the fatal flaw was discerned early on when Sam kills a WW and the last couple episodes have been about exploiting that and making the weapons of dragonglass. You just want to know WHY that kills them? Like if they said, "The Night King is allergic to Dragonglass" you'd feel satisfied? I don't get the concern.
I think that's kind of the idea, no? That the faceless men pretty much are unstoppable but they live by a certain code?
I don't know about that but again, being upset because the show about dragons and magic isn't 100% kinesiologically accurate again seems like nitpicking. Are you mad that there is magic? HOW DID THE SWORDS LIGHT ON FIRE?!
So you are ok that a person can be frostbitten on the astral plain but you are mad because someone's neck didn't break and she didn't freeze. I agree with you that there are issues with the last episode (the last season and a half really), but you are mad at things that have nothing to do with the show. I saw someone the other day talking about how they are mad that the new season started and Jamie was in King's Landing because they want to know how long it took him to get there and what he did. Who cares??? If it took him a week or a month or a day and he talked to no one or stopped at a bunch of pubs...it has nothing to do with the story!