I was fine with them killing Vecna, but the Mind Flayer, being some cosmic horror, shouldn't have been killable. The way to deal with it should've been to flee, and sever its connection to Earth, trapping it in its piss yellow Hellscape. Speaking of which, I guess all the FX budget went to making the Mind Flayer, since it clearly didn't go to the backgrounds.
Best part of the whole season was when they were down in Mike's basement playing DnD for the last time, before going their separate ways. Wolfhard really got shafted this season. I liked his performance in that scene, but the rest of the time, he was just kind of hanging around, not doing much of anything, while everybody bickered until somebody like, looked at a Dorito and had a "eureka!" moment, about how they'd need to triangulate a signal or some shit
Overall, dogshit season of characters info-dumping at each other, with an ending that will almost definitely lead into a movie down the line. They should've axed like half the cast, and kept the focus on the kids it started with + Sadie Sink. Robin annoyed the fuck out of me, and Vicky was just Robin-if-she-ginger, and they both should've died. I wish Jonathon, and maybe Nancy, bit it, too, but the Duffers didn't have the balls to kill anyone that fans would get upset about. My boy, Derek, was the only addition I actually enjoyed. Absolute waste of time that I only really watched because I like the first season, and wanted to see how they wrapped it all up