I love the first season. The story isn't very original, mixing the story of Akira (1988) with the Goonies, but it works well, with a good balance between 80s nostalgia, science fiction and horror.

The second season is pretty messy, with more forced "diversity" shoved down your throat and a story that just tries to repeat the first season, without the mystery that made the first season intriguing.

The third season is the worst in my opinion, being very cringy from the first episode, with all the characters acting like a bad sitcom, trying to make flat jokes that ruin the ambience. Following the feminist approach pushed by most Netflix shows once they are renewed, all the male characters are portrayed as goofy and stupid, while the intelligent girls save the day.

And of course you wouldn't have a TV show in 2019 without.... EVIL RUSSIANS! Showing that the goal is clearly to produce propaganda rather than to entertain.

Watch the first season, and pretend that it wasn't renewed.