It wasn't perfect by any means. Some of the scenes felt like filler in an already bloated run time. Vecna and the Mind Flayer went out like Cans. And the world-building stumbled a bit; at some points it became difficult to know, or even care, exactly where the characters are. The Upside Down and the Abyss aren't fully explained. The audience is expected to just go with it.
On the plus side, all the cast gave their best performances of the show. There are some genuinely moving scenes, and a real sense of closure by the time the final credits roll. Hopper and Joyce moving to Montauk was a nice shout out; that was the original name for the show the Duffers came up with.
Not great, but orders of magnitude better than the abortion that was Game of Thrones final season.
7.5/10