The Guardian says, "it's never boring." Quiet Earth calls it a cult masterpiece
Time Out gives it 2 out of 5 stars and says, "Written by Iron Maiden singer Bruce Dickinson and directed by former ‘Monty Python’ collaborator Julian Doyle, ‘Chemical Wedding’ is an anomaly most notable for Callow’s off-the-rails performance. Unfortunately, most other elements just don’t cut it". Empire Online also has a 2 out of 5 star rating and calls it "often as silly as it is spooky".
HorrorNews.net has a glowing review that begins,
An incredible movie about none other than the infamous Aleister Crowley. A film that delves into deep places that really requires 2 viewing’s to get the sum of its wholeand closes with this:
Final word? – A wonderful film that I’ll re-watch many times! Deeply sustaining, and historically engaging! Brilliantly intelligent horror that comes from a darker place close to home and place in science that is just around the corner.