World’s End Harem Episode 7 was as hentai as an anime can get. There was no story, no character, and no worldbuilding. It was just all sex. That will work for some people, but it doesn't here.
World's End Harem Episode 6 moved the plot forward in a great direction and contained some great scenes. It was probably the best episode of the show so far, and the future looks highly promising.
World's End Harem Episode 5 was fine. There wasn't anything inherently wrong with it apart from how cringy the nude scenes were. The plot has gotten more interesting, so there's that at least.
World's End Harem Episode 4 was a below-average episode that didn't do much right and focused more on showing skin than putting some actual skin in the game.
World's End Harem Episode 3 was the show's best expedition, and it did a lot of things right. The characters and plot this time around were good, and the new direction should also do wonders in the show's future.