Read the other reviews, I concur with all of them. But here is something to consider:
While I am not a true scholar of bad film, I have seen much of the MST3K collection, and countless other examples of truly wretched cinema. And in my opinion, this film may indeed have captured the worst performance in any commercially released film. It's not your ordinary woodenness, it's not merely the sheer inability to convey fear, happiness, or anger. There are countless bad actresses. Sure, the script was already incomprehensible. But that's common too.
No, I believe Adrianna Miles' performance is the result of taking a (terrible) actor, and then handing her a (terrible) script IN A LANGUAGE SHE DOES NOT UNDERSTAND, and only giving her the weakest possible direction on how to parrot the syllables.
Imagine Pauly Shore as the lead in a Chinese horror film, IN Chinese, where the director and voice coach hate him so much, that they refuse to even explain to him what is supposed to be happening in the scene.
To me, its the best explanation of the "This is absolutely fascinatingggg" scene, and every other time she is supposed to be performing "dialog". It's why she giggles while someone is writhing in supposed agony on the floor in front of her, and why she does not seem to recognize that the male lead is not supposed to spit in her hair while wooing her.
See this film. It may be one for the ages.