Season 1 had some truely brilliant scenes with some truely annoying scenes sprinkled in. It was worth it.

Season 2 had a similar feel, but many more plot lines that were just underdeveloped or completely dropped. It wasn't close to as good.

Season 3 should have got the show canceled, in terms of quality. It's unbelievably bad, and unbelievably annoying. I'm watching it just to get through it because I heard season 4 goes back to what made season 1 good.

Season 4, which I just watched, was as good as season 1 up until about episode 5. Then the taint of season 3 creeps in, and just gets amped up and more silly and annoying (just like season 3 was) until it becomes unwatchable, all the way to the end. Season 4 was a bait and switch. A Trojan horse that killed you into thinking that this was a return to the greatness of season 1, only to do a 180 and rehash the childishness of season 3.

It's worth looking up on the internet to see if season 3 can safely be skipped. It is a series ruiner. It's that awful. If I had to do it all over again, I'd only watch season 1. Ultimately, stranger things is a bad show. There are too many good shows out there to waste your time with bad shows.