I enjoyed this episode more than episode 3. It was just the girls being the girls, sort of. That's a change from the original series, where filler was excessive. The animation also seemed better but I'm not an expert.
They pushed forward the story of the four kings and of thr usagi-mamoru romance. Cute romance mostly.
Mamoru kissing Usagi when she is sleeping and cannot give consent is unfortunate, though it awesomes up Luna when she tells him to back off.
Unfortunately, it still seems like the episode is light on story between the recap at the beginning and the thrre transformations, maybe my expectations are off.