Affiliate Marketing Secrets

My passion is movies and I want to start a blog but there are so many blogs I need a niche or do something different, what could I do?

I know the movie review field is saturated and there are many blogs on the web so I came up with a niche. Is it a good one? I find that if I am write about something hardly few people are I will most likely get more views. People love movies but most only watch movies that are mainstream. I watch a lot of movies. So id like to write a blog about great movies that no one has seen, good niche?