I think the most recent episode was one of the best the show has ever done(maybe the best), but it was at the same time very frustrating. It had a really fast paced first act, and then went really dark in the second act. Darker than the show has really ever gone(save for a moment here and there), and it really worked for me. Both the A and B storylines were taking the characters into really interesting places.
But then they had to ruin what was actually a really good episode by returning to the status quo with Miles/Charlie/Neville, and adding some silly mythology stuff with Aaron and Grace at the end.
It was a still a vast improvement over the last couple weeks though.