I've enjoyed the last two episodes very much. In lieu of a reaction I'm going to link to
the NY Times review of the finale. It's got spoilers for everything, but here's a non-spoilery bit I happen to completely agree with:
...it does make me consider how the sense of mystery will likely begin to dissipate from “Game of Thrones,” as longtime theories are confirmed and we pivot toward the final clashes. It’s unavoidable as the story begins to contract toward its conclusion. But I’m already feeling a little melancholy about the show becoming more about big battles and resolution and less about uncovering new pieces of this captivating world.
Isn't this the problem with most shows that have crossed 3+ seasons? I didn't think any of GoT was predictable, but that's probably because I don't read GoT fic or fan speculations. As for the argument that shows ~must get predictable about certain things once the end is near: for now, I'm sticking to my belief that the ways in which stories are told are way more important than the actual plot. In other words: show, don't tell. Setting up a showdown between two major characters may be inevitable, but the way in which it happens needn't be.