First off, let me say that the production aspects of Greta Gerwig's Barbie are ... incredible. It is a beautiful movie and an incredible homage to its subject matter and its selected era aesthetic.
The movie itself is far more complex, with dozens of delightful, if not bravura, performances (Margot Robbie is, no matter what Helen Mirren says, perfection), coupled to an intricate narrative and examination of concepts around feminism, patriarchy, interpersonal relationships, societal norms, existentialism, capitalism, self-actualization, and a stubborn defiance of expectations to turn an message movie about dolls into a cartoon of easy heroes and villains.
I'm always a bit leery about saying something is brilliant, or even profound, but I will say that Barbie is simultaneously entertaining, nostalgic, hilarious, moving, inspirational, and thought-provoking, and I look forward to re-watching it a number of times in the future.
(And if it doesn't have a broad spread of Oscar nominations, I'll be quite put out.)