I laughed and I laughed. Seriously, overacting much? They throw one ridiculous thing on top of another. Utter utter nonsense. In Serbia, everyone gets ****ed, apparently. That's me told you the moral of the film, there's no real need to watch it.
Personally I thought Salo, Irreversible, Ichi the Killer, Antichrist and hell, even the first Hostel film have worse content. A Serbian Film was just too silly in my 'umble opinion. I don't recommend it, but I don't think it'd disturb you that much. Subtlety is not this films strong point.
The bbfc risk turning this film into a Evil Dead/Texas Chain Saw Massacre/A Clockwork Orange style legend in the UK through their actions, and this film in no way deserves it. Silly bbfc.
That is all.