Frankenstein. What makes the novel a clic?

In my opinion a novel becomes a clic if it is well written and interesting while stirring public discussion. Frankenstein is a clic horror story--The subject matter is just plain gross and fascinating at the same time. It is written in a manner that enthralls you emotionally--who do you have more sympathy for Dr. Frankenstein or the Monster? The public discussion it arouses revolve around these 3 questions at the very least: What are the limits to science? What is ethical/moral in science? What makes a living being human?