The "torture porn" genre, often credited to Eli Roth though films of this nature have been made for decades, is certainly getting played out. You can't have torture for the sake of torture. Like any movie, there must be a plot (even a basic one) and characters we care something for. Roth is certainly a master at creating these types of stories as well as knowing when to stop and move on. I'm looking at you "Saw" and "Final Destination" franchise! In Roth's films, the characters interact well with each other and often have back stories worth knowing. The violence and gore serve the plot rather than as the only thing holding the movie together.
I recently re-watched "Hostel", though I'm not sure how appropriate the term "re-watch" is. I've watched this movie twice before but never in its entirety. The first time I tried watching, it was really late at night, I may have been drinking, and I kept falling asleep. I woke to a young man getting his Achilles sliced and fell back asleep. I woke again later to some other torture scene and fell asleep again. The next day I figured any horror movie I fell asleep to must not be worth watching. Then I saw "Hostel II" and fell in love. If this were the sequel, with a great story line featuring both sides of the same coin, hunter and hunted, than the first film must be better than I gave it credit for.