I caught the complete series 1 by accident in a TV marathon when I have never heard of it before.

I was glued to the screen the whole night until 6am. It was so good. Probably my most memorable TV experience after the twist in from Dusk Till dawn.

I never really finished the series, I quit on series 3 or 4.

Im sure I have watched all episodes by now, but I lost interest, because a lot of the story fehlt dragged out too much, when the first series was constant progress.

Same. I watched maybe half of the first episode and then left to go fold laundry and never finished the episode.