Brokenwood is very good. There is quite a bit of humor mixed in with the murders. Some of the murders are horrendous but, from memory, they aren't really seen so the gore factor is low. It reminds me a lot of Midsomer Murders (quirky townspeople, unusual and horrible murders but not gross, unusual detective team, small town with a ton of murders).
I am eagerly awaiting Season 6 which is supposed to drop at some point soon.