This film wont be everyone's cup of tea mainly because of its themes - genital mutilation, rape, incest, violence - but on a more basic level, the filmmaking here is really rough. The cinematography is horrible and the editing scrappy. I'm sure it's intentional, but it lends the film a feel of cheapness like daytime tv. Beyond that, it's a fairly extreme exercise in oedipal themes, but it strikes a very odd balance between humour and darkness. I didn't find it particularly distressing to watch, but didn't find it funny either.
I don't like to just purely criticise a film without trying to find something positive to say for balance, but i'm really struggling to think of anything! I know Kim Ki-duk is capable of brilliance, a few of his films are really great, but for me this one seems like a failed experiment.