It's on my watchlist, should I watch it ?
Depends what you're into.
It's scifi-horror, and starts off on that theme immediately. There's a strong 70s and 80s elements revived (like bleeding from the nose when one uses psychic powers). But at the same time, much of the small town is ordinary enough which contrasts against the secret dark underbelly. The monsters are often more hinted at (but definitely there with elements comparable to the
Poltergeist movie) with full revelations of them rare. That aside, there's a strong Stephen King BOOK flavor to it (I emphasize book as Stephen King movies...probably best not to say, but they're not like this series. There's a "feel" and "tone" to the novels that I feel is better represented in
Stranger Things than in actual Stephen King movies.)
Layered over this is a once common "coming of age" theme from the 80s (and should not be mistaken for a kid's show) with boys who are really close, with more characters (not just boys) given more attention as the story progresses. It's both modern and retro, creepy and nostalgic. But you don't have to remember the 80s to enjoy it (and I know one who remembers the 80s poorly who is leery of this show as a result, and that it's good about it only makes it worse for him).
In later seasons the supernatural elements are made more familiar and the "metahuman" (psychics) are also expanded upon (I'm surprised that got nipped in the bud). The third season adds a lot of Cold War elements. I found it pretty funny (as well as tense and tragic) myself, but I only got a light exposure to the Cold War. I'm sure someone who experienced that (by being teens or older in the 80s) would view it differently.