saw was also torture porn but not as extreme as terrifier and it actually tried to present a semblance of plot. remember also that it was by james wan, who is the cause of the current conjuringification of horror (family friendly, un-scary slop). it was gross but mainstream horror. terrifier is purely an excuse for showing extreme gore, as     mentioned. any plot it ever has is a thin excuse to get to the next gorefest. there is virtually no discernible plot beyond "oh and then art killed these people too, and this is how he did it." if you took him out of his "horror slasher" outfit and presented the same exact film it wouldn't have any pretenses of being anything but snuff.
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