I can't find anything to criticise about this series. The acting, production, continuity and so forth are excellent. It's amazing that of the 6 previous reviews 4 were 9 or 10 stars and 2 were 1 star, and scathing to say the least - and yet all the reviewers are Australian, so it's not a cultural divide issue. Perhaps it just boils down to taste. For mine, explorations of human frailty and the inexplicable nature of relationships, when done as well as The Slap, make for fascinating literature and film. There are no really good guys and, other than Harry, no particularly bad guys. These people are ordinary. Also of interest to me was the inside look into Greek-Australian culture. Persumably this was authentically representative, given that several of the actors are Greek Australians and any major inaccuracies would have been weeded out.
Oustanding in the acting department is Melissa George, whose success in the US is not surprising if this is the class and quality of her acting outside the soap opera arena. She was utterly convincing as the somewhat flaky, "alternative" mother of Hugo - the slappee. I was also impressed by the acting of the various children in the series - they were all very natural and normal. (Quite often poor child actors can spoil an otherwise good production.) It was also good to see old favourite Lex Marinos again.
I'd highly recommend this to anyone who enjoys well-produced thought-provoking drama. I'd be surprised if every the naysayers did not ask themselves or discuss with others questions about the rights and wrongs of not only the slap, but its repercussions. Perhaps I am overly biased towards Australian productions - I regularly find merit in things that get universal scorn - so take that into account.