I think the casting was great and the storyline is great too. Overall it's a very amazing series. My only complaint is that I don't think the actress who plays eleven is that good of an actress, I think her character lacks a lot of depth, but of course that's just my opinion. It looks generic when you first look at it but it is much more complex then it seems (such as the mystery surrounding Hopper's daughter and the many different theories surrounding it).