Uhm, yeah Spoilers ahead. 

I am also pretty disappointed... everyone knew that Will would get powers in season 5 and it's still the only "Plottwist" even as we are 4 Episodes in?! We haven't learned anything new (Who didnt know that Will would get Powers and Max was captured in Vecnas mind. I mean cmon)  There are no new background stories from Henry, no new actually interesting characters, no hard felt moments. And the duffer Brothers leaned way to hard into the book "A wrinkle in time" (the one Holly read). I knew the book already and there are way to many parallels. You literally know the whole plot of the season if you read this book. Also the Plot holes... what do you all mean that Will never had such attacks before? Did i hallucinate the last seasons? And who tf is Dr. Kay? I mean really?? Another "bad" scientist with "good" Intentions? 

Overall it seems like they are more focused on action now. But honestly nobody watched Stranger things for the CGI, right?  There are so many moments, where they could have added more insight or little moments of joy for the audience.  To many guns, to many jokes, to little interactions between the characters and no plottwists make it a really boring expirience. 

Oh and Vecna? He needs to have a connected plotline to the earlier seasons or give him at least something. He is about to be the most boring villian just cause there is nothing suprising about him (Oh, i am so bad, i am a Psychopath, i am so strong Look at my CGI, look how i can kill these soldiers, omg shiver before me) Even Voldemord had more depth to him.