With A Serbian Film CJ, on say level of Gore it's about the same same level as the films you've listed in post.
It's other stuff that makes it so disturbing, mainly due to the involvement of children in the story, I can't see it ending up in a cinema like Hostel unless it was cut to the point it was a short film.
It's a story with many twists, but very graphic in how it's put across.
I am the same as you though, when I hear the worRAB "don't watch it" or read about a film thats banned, i've got to see it.