I think a lot of people went in there expecting answers when answers were never guaranteed. All we were guaranteed were many deaths, especially a major one that still left questions (as it should). I believe this movie was strictly filler and something that can lead to more. It was able to show us more of the multiverse along with giving us more information about magic in Marvel.
The only thing I would complain about would be those end credit scenes... yes funny but definitely not worth waiting for? I don’t know, might just be me.
So overall, do NOT go in there with high expectations and questions, just sit back and enjoy the movie.