I just watched OBSESSION to see what all the fuss is about. I don't usually watch these types of movies, also, how many movies about "obsessive love" can people write? I have to say... I enjoyed it. CREEPY, yes. Great acting, great script, great experience.
"Obsessive love" is a determined force thus ripe for difficult and explosive situations. Similiar reason there are many heist movies. When a lot of things can go wrong or unexpected, it's ripe for a story.