As someone who was slightly let down by the season 3 finale, I think the opening episode of season 4 was a surprisingly good way of continuing the course of the story and setting up an exciting new season. The fresh progression of the plot seems extremely promising, and I can't wait for what comes next.
The episode begins with the unexpected return of a certain important character, and that immediately sets the course for the episode's fresh story lines. Besides that, the episode focuses mostly on Frank and Claire's personal situations, as well as the New Hampshire primary. This episode could've focused a little more on the politics and a little less on the relationship drama, but I'm sure the rest of the season will have more political intrigue in it.
The acting is top notch as usual, especially the performances by Kevin Spacey and Robin Wright. Neve Campbell also does a decent guest performance, and I hope we'll be seeing more of her character in the future. The dialogue between many of the characters is well done and fascinating. The episode is also directed very well, as its atmosphere makes it stand out as a new chapter for the show's story. The writing, as always, is pure quality.
All in all, I think that Chapter 40 is the start of a fresh direction for House Of Cards, while also continuing the story and style of the series without changing too much. It looks like we're headed for another great season!