First of all, billing this show as science fiction is inaccurate: there's nothing scientific about the mystifying events. If anything, it's a fable that takes place in a modern setting.
With that said, the underlying theme is intriguing, but the eerie atmosphere and the plot twists are not enough to make this a must-see show. The main problem are the characters: none of them behaves in a credible way. I get that Icelanders can be a bit quirky, but here they are all simply unconvincing. None of them freaks out seeing their own doppelgangers, or people who haven't aged a day in 20 years. They take every inexplicable event in stride and barely show any emotion, episode after episode. And that behavior gets old really fast.
With that said, the underlying theme is intriguing, but the eerie atmosphere and the plot twists are not enough to make this a must-see show. The main problem are the characters: none of them behaves in a credible way. I get that Icelanders can be a bit quirky, but here they are all simply unconvincing. None of them freaks out seeing their own doppelgangers, or people who haven't aged a day in 20 years. They take every inexplicable event in stride and barely show any emotion, episode after episode. And that behavior gets old really fast.