We know these people. They're intelligent, charming, fallible and not always predictable. Three-dimensional characters, with sometimes untidy lives. We see their bad behavior, unreasonable bias, decency and moments of brilliance as they navigate the ups and downs. There's a not unkind truthfulness to the way their stories are told.
The writing is extraordinary. The sets, the costumes, the editing - clearly a team of pros brought this together. And there's the dialect - articles are rarely used, and there's plenty of "owt", "nowt", "summat", "dozy", and "appen". It's all brought to life by top-notch actors, some familiar, others new, but all well cast.
On the whole, outstanding work, which is what makes this series so wonderful and believable.