A few seasons I finished recently:
Bron|Broen Season 4: It was finally time to say goodbye to another one of my favourite series (up there with "The Wire", "Breaking Bad" etc.,). Sofia Helin's Saga Noren is also one of my favourite characters in all of the TV land. I am happy that it ended on such a high (and right) note. I am happy that they maintained the character of Saga without dilution. The humor in this series is also very natural since it comes from Saga's social awkwardness - one good example of injecting light-hearted moments within a tight, serious drama without distracting from the tension.
Any other suggestions similar to Broen, Borgen or Forbrydelsen?
Billions Season 2: I liked Season 1 of Billions, but not at the level many people did here. I thought the last 3-4 episodes dipped in quality and even the final encounter between Chuck and Axe didn't really interest me that much. I was hesitant to watch S2 for a very long time, but I am glad I finally got around to it. The writing has certainly tightened up a lot this season focusing on the correct things and cutting out a lot of flab.
The End of the ** World Season 1: The best thing about this series is that it is short and can be completed within 3 hours (just 8 episodes with a running time of 20+ minutes each) - a luxury that is not often available to us. If you like the trailer, you should find it interesting too, not otherwise. On the flip side, shorter running time means that you spend less time with these characters compared to other series, so I am not sure how fondly I will recall it a few months later. But unlike "13 Reasons Why", which left me with "Wait! There's another season?", I'd watch if they ever make another season of this (though I am also fine if they don't).
Dark Season 1: I would wait for another season before forming a firm opinion. This season has laid a good foundation, has introduced the characters, the mythology and also has ended on an interesting note. How they carry this forward is more important (I also felt similarly after the first season of "The Expanse" and that has become one of my highly anticipated series, but this could go either way). Let's see...
Black Mirror Season 4: Continues to impress. This and "Rick and Morty" are two series which have generally good episodes with a few OK (or weak) episodes here or there, but also have episodes that simply blow your mind and refuse to leave your head for a while. While R&M's third season was not as strong as S2, BM's S4 is stronger and more consistent than its S3. All said and done, the earlier episodes of BM (Pre-NetFlix) still have a special place in my heart.