This is probably the best, and most frustrating, of the episodes. A tremendous amount of backstory is filled in and questions are answered. It's frustrating because as many new questions have been asked as were answered. Given the aimlessness we've put up with until now, there is no hope we'll have those answers before the end of the series.
It's also frustrating because it shows that the writers are capable of thinking their way across episodes into a proper arc, and that we only see a glimpse of it this late in the game.
Granted, it has the same slow first half that tests the patience, but the second half tells the story, causing even more frustration for having wasted time while this type of storytelling was possible.
The relationship between Russ and George has a bit more detail now. We can see the father-son relationship passed down the generations. The chill between fathers and sons is a contrast to the warmth between grandfather and grandson.
The final scene is a masterpiece and as another reviewer said, it's several seconds short of being totally satisfying. The closure we are all after is something we have to make up in our own imaginations one way or another.