Well it was my cup of tea.
I binged watched it until 2h30 am last night. Simply could not put it down to go to bed at episode #6.
Anyone born in the the late 70ies, early 80ies will identify with the kids in this movie. The music and culture of the early 80ies is everywhere in this movie, and brings back good memories for those born during that time (BMX with light dynamos, walkie-talkies, dungeons and dragons, rotary phones, 80ies movies/musics). Speaking of which, perfect use of music and sound effects in this.
The movie is a bit of a homage to supernatural/sci-fi flicks of the 80ies like D.A.R.Y.L., E.T., Goonies, etc but with a horror monster feel a la stephen king to it and obviously current TV means.
The story revolves around a missing boy, a strange girl, and the 3 kids who become friends with said strange girl while looking for the missing boy. And there's a sci-fi/supernatural element behind it. All the characters are incredibly endearing and you immediately become invested in the story from the first minute to the last. The dialogue between the kids is very funny and gives them depth quickly. If you don't like the first episode, put it down, it's not for you. While watching the series, during the first 4-5 episodes, my main worry was that they wouldn't really wrap it all up, but they do. So have no fears about that.
One of netflix's best efforts, probably the best I have seen of them. There are rumors it's been renewed for a season 2 already, but I can't find anything official yet. It's been said that S2 would be a sequel more than an actual season two. Whether or not there is a season 2, it stands alone on its own as a season.
I think there's something in it for everyone but people aged between 35 and 45 will identify with it a bit more I'd think.