Greenstone, a cross-cultural love story supposedly set in 19th century New Zealand, followed neither of these basic rules and ended up losing the plot altogether.
The writers apparently wanted to write an "epic" story with a cast of easily-identifiable villains (arrogant, imperialist English) and victims/heroes (noble Maori, oppressed Irish) but shot themselves in the foot by inventing a false history of New Zealand to suit the story they wanted to tell. As a result, the story had no credibility.
I don't understand the writers' motives in doing this. Were they trying to invent a new history of New Zealand to suit a modern political agenda? Or could they simply not be bothered to research their subject properly? Whatever their motives, it didn't work. And a golden opportunity to create a truly believable historical TV drama about 19th Century New Zealand was lost.
That's a shame because New Zealand TV struggles to fund major drama series at the best of times. And a wasted opportunity like this doesn't help matters.