This film has some good ideas. There's the freaky circus (always a good foundation of a horror film), there's some quite bold eroticism, and it could have worked out well. Unfortunately it seems obvious that there wasn't any money. The problem isn't with the bad effects, nor with the various goofs, nor that the villain looks kind of funny. Mainly, it seems like the plot isn't developed enough, making leaps because we can't afford to make a fuller version of the story. Too cheap for the average viewer, but a Hammer horror fan will appreciate it. The kind of movie that may be worthy of a good remake so it can reach its full potential.
Review of Vampire Circus
