The degree to which they recreated the style, tone and atmosphere of movies from the early 80s is incredible. Every detail - sets, clothes, props, music, etc. - is exact. I happened to watch The Terminator (the original, 1984) not long after, and you would literally think Stranger Things was made by the same people, in the same year (if you like Stranger Things and for some reason haven't seen The Terminator, watch it now). Throw that movie, Poltergeist, the Goonies, Stand By Me, the Breakfast Club, and numerous other movies from that time period into a blender, and you have Stranger Things.

The story is interesting, and the acting is mostly very good. The only negative is that being an 8-part TV series (so far), the pacing drags at times. Some of the actions and events are illogical, and there are a few plot holes. The basic story is kind of standard sci-fi/horror, but it's done very well.

Those are minor gripes. The longer format also allows it to cover a wider range of its influences. It's not perfect, but there are few TV shows or movies being made today that are better.