We went to see this last night (opening night in the UK) and, like others, I left feeling quite disappointed with it.
I HATED Wanda's entire arc. It pretty much doubled back on everything in Wandavision, to the point where she seemed to learn nothing from the events in Westview at all. I get that grief can be a powerful force but I feel like the writer just destroyed everything that made MCU Wanda what she was. She was just stone cold in this for the majority of it and, to me, that isn't who Wanda is in this universe.
The Illuminati was pure fan service. It didn't seem to serve any real story purpose... it was just "Look who we can shoehorn into this movie for the sake of it!" Although I'm sure that Strange's comment to
spoilers:
end of spoilers about the 1960s is a big part of the setup for a later movie.
I'm starting to tire of all the CGI battles now, I think. I miss the days of a proper hand to hand scrap and I wish the MCU would make a "smaller" film, rather than each one having to be bigger and more spectacular than the one before it. It seems that Disney+ is getting the smaller stories and all the "epic" ones have to go on the big screen without fail.
Overall, not a big fan of this movie. It could've been incredible but, for me, it missed the mark by a long long way...