Saw is not unlike any other post-Se7en thriller/horror in which the serial killer comes up with some overly complicated method of killing people. I think Se7en's impact on its subgenre has been greatly underplayed. It was definately on a smaller scale, but it had a similar impact that Halloween, Scream, and Ringu had on their respective subgenres. A lot of movies tried to mimic their success, but most of them either totally missed what made them so great (Halloween's masterful building of suspense and lack of using gore as a crutch, Scream's self-aware nature and wit, Ringu's ingenious structure and a twist that doesn't come out of the blue, Se7en's awe-inspiring direction and intelligence), or just couldn't quite make it work in the same way. There've been a lot of Se7en ripoffs, several of which starred Morgan Freeman, Saw is no different (except it doesn't have Morgan Freeman in it)
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