I never bothered reviewing the 3rd season of Stranger Things because I didn't really have strong feelings about it one way or the other. Season 3 was a bit of an improvement over season 2, but both were a resounding "meh" for me. The first half of season 4 is also kind of "meh", but I think that it's worth talking about this time around because it both succeeds tremendously where seasons 2 and 3 failed, but also then kind of ruins any goodwill that it had built up.
The fundamental problem that I have with Stranger Things after the first season is that a continuation of this same story simply doesn't need to happen. The first season worked so well, in large part, because of its intriguing mysteries. Aside from sequel bait, all the important questions and mysteries of season 1 were solved, and the first season felt satisfactorily resolved. If this show was going to have sequel seasons, then I think a more anthology-like approach would have been more appropriate, with each new season telling a new story, with new characters, confronting a completely new and unrelated horror, and solving completely new and unrelated mysteries.
By continuing with the same story, the audience gets to bring everything we know from the first season into the new story. Even though seasons 2 and 3 went in their own directions and took different inspirations compared to the first season (season 1 being kind of Twin Peaks meets E.T., season 2 being inspired by Aliens and Terminator, and season 3 being a play on a Body-Snatchers concepts), neither season 2 nor 3 introduced anything tremendously new. There wasn't much mystery because the workings of the Upside Down, the mechanics of the demogorgons, and the machinations of the secret government labs were all established. Season 3 shakes things up a bit with a body-snatchers plot and an ending that actually destroys the status quo and moves our characters forward with their lives, and is perhaps the only reason that season 3 did not feel quite as stale (for me) as season 2 did. But the fundamental problem was still the same: we've seen all this before, more or less.
Season 4's "monster of the week" approach feels fresh and new.
This is where season 4 kind of shines. It's new monster, Vecna, isn't just another demogorgon. He's something that feels completely new and threatening. His motivations are unknown, and despite being explicitly inspired by Freddy Krueger, the mechanics by which he operates are completely new compared to the previous monsters. This finally gives our characters an actual mystery to solve. For the first time since season 1, the threat of Stranger Things is finally mysterious and unknown again.
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