Obscure movies are better to review. If the movie is popular, chances are many people have written a review on it, or the majority of readers have already watched it. If you review something that many people haven't seen, then you may draw in some interested readers and encourage them to watch the film.
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Oooo, if I wrote a review for it, I don't think you'd agree. I wasn't too happy with it if I'm honest...but, I might go and have another look at it. I did wath it a couple of years ago so I'd probably think differently of it.