If I could do it all over I'd stop after Season 1
I feel the same. I may even say that had I only seen the very first episode of season one, I would have loved the entirety of that 1st episode's storylines and actors. But, I got hooked.
I finished the last season and loved it. The whole show is great. It's my favorite next to family guy and breaking bad.
Because there are so many ferocious series, both old and new, and for me it kind of did not deliver the punch I was hoping that it would. Still, I loved the nostalgia of it. Brought back memories of nerdy friends from those missed younger years.
Have you seen Dark? It is one of the best time distortion and mysterious series that I have seen. If you liked/loved Stranger Things, this may be up your alley!
imdb link:
https://www.imdb.com/title/tt5753856/