At the end of season 2, Baltar was president, the humans had landed on New Caprica, and the Cylons had just invaded. The show showed us back then that they weren't afraid to change the story line. Now in its final season, the show can take bold steps without deus ex machina resolutions.
What was nerve-wracking about this episode was seeing Roslin & Baltar on the base station; seeing Boomer assassinate Natalie; and wondering the mystery behind Gaeta's singing. The promos for the upcoming weeks were also awesome. Will Lee become President? What will the role of Zarek be in the new government? How will the humanoid Cylons and the Centurians respond to Boomer's act?
This episode is an excellent example of exactly what this show is capable of achieving.