Oddly, I don't see the comparison between these two films....I like Saw in the same way that I like Silence of the Lambs and other Psych-thrillers- the game and the ins and outs of every trap I find fascinating, the plot line is very intelligent, and the reasoning behind each character and act of contrition makes up for the icky stuff. Saw also has minimal nudity (unless it's actually part of the trap) so I don't see where the evidence is to simply label this a "Titty Torture" flick and cast it aside.
From what I have read, I think more people would have responded better to Hostel if it hadn't been marketed as simply a torture flick...people actually got up and walked out because the level of torture was NOT OBSCENE ENOUGH...yes, it has a minimal plot line (people in other countries get their cherry popped over torturing an American, to the point where they pay top dollar; whoo hoo). I have not seen Hostel, it's just not intelligent enough to warrant my time.