I've seen most of these shows and they were pretty well advertised by netflix. One show I feel should fall into the hidden gem category is Gypsy. It got cancelled after one season but It was really good, its not even my type of series but I really enjoyed it! You can check out the trailer here
My second which I dont think its hidden since its also pretty well advertised by netflix would be Ozark
What did you like in this show ?
It's an original plot with intriguing twists. Jean, the main character, kept surprising me with her own disturbing entanglements. She is a therapist and continues to cross professional and personal lines and cannot resist manipulating peoples' lives which had me completely captivated.