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Since it has to be an adaption I say Dread. If you asked worst movie based on Clive's written work it would be Underworld aka Transmutations. But since you didn't Dread is the worst. Lousy acting and poor direction. And where was the budget for the film? Nowhere.
In fact I found myself wanting this to be not Clive Barker related.

BTW, I still have not watched Hellraiser Revelations and won't ever even though it is on Netflix.

L8r
Doug