[Tom4784]

There's very few decent horror franchises since once they begin doing sequels the premise becomes diluted and loses what made it a good horror to begin with.

The first Saw was an effective psychological horror but it was reduced to endless gore in it's sequels, Halloween was one of the godfathers of horror but it's legacy was tainted by endless sequels. The same could be said for Hellraiser, Nightmare on Elm Street, Alien (okay Alien 2 was excellent but beyond that it's dead to me), The Omen and so much more. Sequels are a death knell to any decent horror film.

The only exception I can think of is the Scream Series which maintained a good level of quality throughout (we'll forget about the misstep that was Scream 3).