The first season is excellent with suspense and tension in the right measure, the second starts to walk a little beyond the sun but it's still enjoyable, the third and fourth season are so bad and the script is so Nonsense that is an offense to any serious screenwriter ,Millie Bobby Brown is one of the most overrated child actresses of all time, Sadie Sink is so much better and doesn't get half the acclaim that MBB does ,the rest of the child cast is ok and doing well considering their ages ,my advice is watch the first 2 seasons and consider the end of the 2nd as the series finale and voila you have a 9/10 show.