Tried being too provocative?

I liked the film but there were parts that took me out cause it felt like they were trying too hard in the dark comedy stakes. They made the main family overly dysfunctional with the trading of the C and F words to one another, and the girl joking about being raped before leaving, and then when the dad turned up for the first time and said his bit. In fact with many characters it felt very, I dunno, scripted and obvious, and left me thinking how nobody really talks this way in real life. Willoughby and his wife chatting being another example.

Talking of Abbie Cornish, I thought that was strange casting. I couldn't figure out what accent she was using, and why she had it. Plus her good looks seemed somewhat out of place.