I especially liked the early books before (spoiler) Fran got killed - after that I went off them a bit. I felt they had a strong sense of the setting - I may be completely wrong as the closest I've been to Shetland is Aberdeen. This was something I was very keen on at that time.
I just noticed that Netflix has the series, and wondered if people who liked the books enjoyed the series and found it worth watching. I did avoid it on free to air TV for several reasons. I no longer enjoy mysteries that drag out over weeks, and, I'm sure Douglas Henshall is a fine actor, but is just not my idea of Jimmy Perez. Additionally, at the time, I was sort of emotionally invested in the books and thought that I would be inevitably disappointed. I seldom find TV or film productions of books that I enjoyed live uptime expectations.
However, that was several years ago, and I am probably over that - for these particular books, at least - by now. So, any unbiased opinions of the series from readers of the books, please.