Saw this for the first time on Netflix after reading about Season 5 controversy on an american news website, was completely blown away.
Movie quality writing on a television show. Addresses social issues in a way that you don't feel preached to.
It's very edgy, even for pay television. Some of the story content you probably wouldn't even see in a movie unless you were at Cannes.
This is adult television made for adults, make sure the kids are in bed. It's awesome.