I've seen a documentary about the real life story, so I was interested to see how it was portrayed in a fictional series. They did well, obviously there were quite a few things different from the real story but the basic gist is there.
The main actor did a great job - he was perfectly creepy, frustrating, believable when talking himself out of situations and pathetic all at once.
The acting in general by everyone else was well done. I do wish they'd used actual New Zealand actors (or even aussies) as I could still hear the English accent from the actress, but she did do a good job at a hard accent! (I'm Australian).
Some parts were glossed over or rushed, but I enjoyed the show and 3 episodes is just enough for a mini series.