I actually enjoyed the finale, but I agree with everyone else, that this should have been eight episodes max.
I thought the shoot-out at the cave was quite gripping even though I kinda knew how it was going to play out from reading the book.
And I agree, the conclusion where the creature is supposedly vanquished is a bit of a lame let-down, but the show pretty much stuck to how the book played out, and as anyone who is a Stephen King fan knows, Uncle Stevie can write hair-raising page-turning beginnings to his novels, but often has trouble sticking his landings. This book unfortunately was no different. Valiant performances by the actors though - especially from Mendelsohn.
I actually thought the movie might do a twist at the end:
I'm also not too horrified by the thought of a second season, especially if Price and Lehane are involved again as writers - I thought they made a lot of improvements to the original material from the novel, and they could potentially write something new and interesting. i thought the actor's performances were uniformly great, and felt like they were really starting to gel as a team in the finale.
RIP Andy, I knew you were a goner, but you were a gud'un.
I wasn't sure who those kids were supposed to be either, but that's a good guess. At first I thought they might be the two kids trapped in the old-timey cave-in, but their clothes were modern.
I missed the bit about Holly getting a scratch, so I'm very glad for the eagle-eyed people on these forums!