Both the original Swedish and its American counterpart borrow the Stephen King theme of making the horrors of adolescence into real monsters. The lead characters, Oskar and Ellie, are latchkey kids in a dismal blue collar town. Oskar lives and unhappy life of being bullied at school and making his own dinner alone at night. Ellie spends all her life looking out a window and hoping for a friend. They cure their loneliness by befriending each other.
The book on which the movies is based is much more horrifying that either movie suggests. The relationship between Ellie (or Abby) and her father is not wholesome. Ellie's history is truly brutal. The ending is more graphic and gothic than hopeful.
Each movie gets further from the original novel.
So far, the series follows the path taken by the movies. It doesn't ask why. It doesn't care why. Instead, it wants to cure Ellie, when those of us who saw the movie know that Ellie doesn't want a cure.
Whether or not the search of the "original" monster can sustain the series yet, I can't tell. It seems to meander, has way too many characters, and so far does little to develop the two principal characters. Since they are the heart of both the book and the films, that may be a problem as time goes on.
Still, given the current state of drek when it comes to originality in Hollywood, I would rather watch the remake of remake of the film version of a novel than about 90% of programming.
The actors are good. The story is interesting. And i hope the show continues to expand the story.
Let's give it a chance.