I concur, first season was incredible, one of the best series I've watched in the last few years. And it had a real ending + finished storyline: no aggravating cliffhangers or loose ends, no endless milking or filler episodes to uselessly extent the viewtime, just a very good finished story that never left me bored. This feels so rare these days.

I'm now watching the 2nd series and so far it's been so so indeed. I'm not very far yet though.