Mark T’s review published on Letterboxd:
A gaudy showcase of Sia making one bad decision on top of another (making its title character a supporting role! giving herself a film-stopping cameo! giving Ben Schwartz cornrows!). And given that its foundation as a Rain Man clone with musical numbers is quite shaky as it is, it's impressive how much worse each storytelling flourish gets. One second, the film attempts to visualize the title character's worldview through sets with simplistic shapes and colors. And the other second, it pushes her to the side in favor of a "get yourself together" drama that's only interesting because it's been a while since Kate Hudson has been in a major role (to her credit, she's pretty convincing as a hot mess). Keep in mind, Sia takes this "one second" approach literally, so you get a movie that cross-cuts so fast that neither one gets to register. Practically the only thing that unites both modes is the constant facial mugging from Official Sia Muse™ Maddie Ziegler, and to no surprise, that becomes grating from minute one.
Hudson and the endlessly charming Leslie Odom Jr. each contribute a half-star, hence why I don't think this is an absolute lost cause. But man, the difference between this and an unmitigated disaster is miniscule indeed.