IMO -- I Saw the Devil = brutal revenge flick and a damn good movie. But a slasher flick? Nope.
So it appears Suspiria and Martyrs will ultimately be removed (much larger con count than pro in the poll right now) so we need a few more opinions on I Saw the Devil before we cut it out, as well. As DG said, majority rules.
Just in case, put on your thinking caps, folks, because it looks like we'll need at least 2 (possibly 3) more titles for replacements.