I think I like all the themes!
What I dislike though is the more recent playmobil trend of making the themes (even classic ones) less realistic looking and more preschool-ish.
For example:
Pirates are cool.
Ghost pirates with rainbow coloured clothes are not (IMO).
Victorian theme is cool.
Newer Victorian home and even modern house themes are way too colourful like preschool colours: yellow house with red and blue trim? yuk!
Animal/farm/zoo themes are cool. But the more recent farms, again, suffer from the preschool colours syndrome. Why can't it be realistic like the classic ones?
And back to pirates. Even using the same mold as the original 3750 pirate ship; the newer ships (and even the corsairs/schooners) use bright outlandish and unrealistic colours! WHY, playmobil, why?!?!?!?!
And why do the new Knights have lazer-powered-chainsaws?