Good show but for the crater-sized plot holes
Overall I liked it for the zany characters and great scenery. But the plot doesn't hold for more than 10 minutes.By the last episode it's shattered in so many pieces that it's impossible to put it all together.
Spoilers throughout
1. If you're Bob Platt and going to screw over the most feared man in town, why not flee first and sign over the deed from a position of safety (e.g., Auckland)? Even if you think you still have time to flee, you don't think anything is amiss when the screwee's two sons arrive wanting to go fishing?
2. Why did Matt first try to stage the reveal that he is Robin's father on the boat? He wanted to show her the videotape.
3. No cop would go to Matt's place to record a confession in the name of indulging in his desire to "maintain control," or whatever claptrap Robin justifies it with. Just a silly attempt to heighten the drama with panic codes. What if she is shot with a silencer if she uses the bathroom? Drugged and raped by Matt or one of his unstable associates? Even just bit by a dog on the way out? Any halfway competent cop tells Matt that if you want to confess, you come to the station for proper videotaping and witnesses or don't confess. I also liked how Robin says, "So shall we just jump right into it then." You don't want to ask him his name for the record or if he is under the influence of drugs or alcohol?
4. The whole rebellion of the sons at the end was laughable. Transparent attempt to redeem them at the expense of their father. Made the father more simplistically evil, so we don't feel quite so bad when he dies, and maybe we feel that regardless of whether the sons continue the meth empire, they were obviously victims, not responsible for their own actions.
5. As sergeant tells Robin, every potential informant on Matt has ended up dead. So what does Robin agree to with Matt's maid who shows up at her house high, willing to testify against Matt? See you day after tomorrow! She goes to Robin in broad daylight - if nothing else, Matt could easily catch wind of this very meeting and suspect the maid has turned. But Robin makes no mention of safety concerns to the maid. No thought to put her up at a hotel far away for a while.
6. The absolute height of ridiculousness, that the sergeant would involve Tui in the pedophile ring. First, the sergeant felt some mix of fear and friendship towards Matt. Either one of those logically would have led the sergeant to not involve Tui. Second, neither Matt - whom we are led to believe is the kingpin of this neck of the woods - nor any of his sons or associates knows anything about this pedophile ring to ever suspect the sergeant of Tui's rape?
7. What was the point of Robin passing out at sergeant's place? We, like her, question whether he raped her, despite his assurance that he didn't. Okay. Seems to have no consequence on anything else either way.
8. Tui just gives birth on her own, probably severe internal injuries, and they don't take her or the baby to the hospital?
9. Where is Tui's mom in all of this? We see her once and that's it. Absence especially glaring at the end, after Tui's birth, when Robin is playing mom.