promising material has been reduced to the tropes it was once so good at subverting.
Not what GoT was about. When the main character of season 1 was killed off, it wasn't even the series finale! That's GoT. In a big battle
I tend to agree with this. But I think it applies whether or not you have read the books or not because those themes did translate across in the earlier series.
Speaking of someone who hasn't read the books all the way through (don't shoot! Just couldn't get into them and for me it's the one exception to the rule that the books better - I enjoyed the show so much that the books were actually spoiling my experience of watching!)... the reason I loved the show at the start was for similar reasons - taking such an anti-Hollywood/cliche driven stance and totally screwing with well worn conventions and viewer expectations.
As for the episode itself, the BBC review put it well - "There are great moments, obviously. The episode's first act is a masterclass in fear and tension" but "when it comes to character deaths - a hugely overhyped aspect of this episode, which in reality planned out as a series of safe and predictable choices".
I'm also wondering what happens now that the NK is gone. Maybe the threat is not actually gone? But It sort of feels like we've prematurely climaxed and now have to go around finishing everything else off!
I'm very willing to be proved wrong however. Maybe this is all part of a bigger plan to subvert our expectations. Fingers crossed the remaining episodes totally mix things up.