Most actors really love it, that's what they want to do. They burn to do it. And so they'll read a script and think, that's an interesting part. And because they love acting, that blinds them to the fact that the rest of it is pretentious nonsense, which it very often is.
Fantasy is totally wide open all you really have to do is follow the rules you've set. But if you're writing about science you have to first learn what you're writing about.
