The actor that plays Jonathan is so creepy looking, that I find it impossible to think about anything but how corpsey he looks any time he is on the screen
I thought Billy stole the show in the first 6 episodes or so. Great casting, writing, and acting there
Similarly, I think the casting is one of the things that makes this show work. Hopper is a believable brute, heroic but also slovenly and gross. Erica was an awesome character. Millie Bobby Brown is great. Sean Astin and Cary Elwes both brought a fun wink and nostalgia callback without getting in the way. Best of all, as this show hearkens back to Spielberg-esque teen ensembles their chemistry and energy is absolutely parallel with those "Goonies" type flicks.
"Mr Clarke" belongs in the dorky teachers who think they are cool hall of fame along with the guidance counselors from "Freaks and Geeks" and "Bob's Burgers." I love how all three have an enthusiasm that they think is endearing, which actually makes them irritating.
I love everything about this show except for Winona Ryder. Three seasons in, I still can't decide if its the character I don't like, or the acting. Just a lack of warmth, and too much whining. She did act the conclusion scene/move well.
I think Millie Bobby Brown has a chance to have a good enough career where the first thing everyone thinks of when they see her is not necessarily ego waffles and Stranger Things. I was 30 minutes in to Godzilla before I realized she was the daughter. She really is great in this show.
Many fans are saying this is the best season. I'm not sure I agree (season 1 came out of nowhere, was a riveting slow burn of fun and fantasy, set an incredible tone, introduced some memorable characters, etc). What I do agree with is that season 3 was awesome, and a great example of how a show should grow and progress season by season. There was no way this would have been beloved if this (3) was the first season. It took two seasons to get the plot, characters, etc to this point.
The three best surprises/stars of season three were: Erica, the Russians, and the Mall as featured characters.