The episode was tedious during the first half of the show. Dominated by stiff cardboard acting by the supporting actors. It managed to redeem itself once the supporting actors were "removed" so the core cast were able to engage in their classic dialogue and banter. The core group have a highly enjoyable dynamic and their energy effortlessly bounces of each other. Then enter the supporting actors, where it felt that they didn't know how to perform the roles.
Overall, this is for the die-hard Dwarfer, but will fail to engage a new or 'fence-sitting' audience.