All of the Alien series have strong directors, each with their own unique vision. I like them all, each for different reasons.
As for bogeyman franchises, the worst must be Halloween with its desperately contrived plot twists to keep familiarity alive and introduction of hip actors and splashy gore to secure the teenage market. A Nightmare on Elm Street was almost tolerable up to about 5, but Craven's self-indulgent New Nightmare was a shockingly bland and wasted effort.
But every once in a while, a spark of interest arrives late in a series, such as the underrated Jason X (self-referential and unashamedly plagiaristic but highly enjoyable nontheless).
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