The movie essentially exists as an epilogue to Wandavision. It not only fails on that account but lacks any creative focus beyond throwing in random cameos and easter eggs. Only the most devout MCU fans will enjoy this bloated, unfocused and creatively messy movie.
As for Wandavision fans, expect to leave incense after watching how screenwriter Michael Waldron completely erases the character development sowed by Wandavision creator, Jac Schaeffer, by turning Wanda Maximoff into a serial killer bent on killing and draining a teen dimensional traveler's power, so Wanda can skip universes, kill her doppelganger, and raise her children as her own. Wanda essentially morphs into every sexist hysterical female stereotype that Schaeffer intentionally avoided in order to provide Elizabeth Olsen material to showcase a morally gray character suffering from grief.
The direction by Sam Raimi is fun and inventive but can't overcome the lack of innovation in yet another multi universe film. Critical darling "Everything Everywhere All At Once" starring Michelle Yeoh and directed by The Daniels does it better and is burning up the specialty box office. Marvel tries to slip in cameos from Twitter casted actors, crossovers from television's Inhumans and What If, and 90s era X Men animated series. It's fan service designed to hide a lack vision and creativity.