I just finished it in three days (s1-3). I could not help it. It's a the best sci-fi I've ever watched for the last five years. I have watched movies since 1980s. For the last five years, it's difficult to find tv series that both started and ended well. Mostly I found it started well but went off rails after 2 or 3 seasons. I felt many times the story did not serve any purpose or meaning, purely for escapism. Many times it lacked depths and had many plot holes or discontinuity between seasons. Dark is not like that. It's a well rounded story that gave attention to details and continuity. It stimulated my thoughts and made me reflect on life behind its quotes and words. For some characters the story ended tragic but after the final season the explanation was acceptable within the realm of fiction. Dots were connected and not many dots were left open. It's rare to see something like this in the recent years due to many of series are just money grabbers or time grabbers. At the end, watching Dark was like being well served full meal and left being satisfied.