I've been thinking that the real problem with Star Wars (both Prequel and High Estrogen) and the Ghostbusters Reboot is that they're expecting to tell complete story over three movies. Beginning in one, middle in two, and end in three. So each series delivers two movies with neither a satisfying climax nor a proper cliffhanger.
By contrast Ep4: A New Hope had a real ending. So did Ghostbusters (OG).