I saw REC and I thought: "It looks good. It is rare and I don’t finish it. I saw the "made in Hollywood," version and I liked Quarantine. There was much blood and a very bad atmosphere, as sick. And I saw REC again and now if I understood and really scared me.
The director is Jaume Balagueró, the first film I saw of him, The Nameless is ... ok one of the most terrifying movies I've seen. No gore, no blood, but is something that is very disturbing and has very bad karma.