Generally, Universal doesn't seem to be very good at writing shows... the only truly excellent seated offering they have is the Horror Makeup Show, and that's largely been the same script retooled and ad-libbed for over a decade plus. Celestina and Tales are steps in the right direction, but like Blues Brothers, they're diversions at best, not destinations (i.e. anything with a dedicated theater).
The new Beetlejuice revamp is rough. Fear Factor is lame. Poseidon's Fury v2.0 is still clunky. Sinbad (which they had a chance to revisit!) is heinous, borderline regional park in execution.
I'd love it if Universal really put some effort into creating new permanent shows in its lineup, but they just don't seem to be very good at it.
EDIT: Forgot to add that Animal Actors is also very good, though that show's one of a kind for the resort and doesn't really require much "writing."