This is so great. Peele's progression from Get Out to this remarkable and makes me very excited about his future.
Most horror movies are lacking in two areas: script and performance. Us is especially strong in the latter. Lupita is obviously fantastic. She moves with force in regular form, scared yet defensive. Her face belies terror well. Her doppelgänger is even better; she croaks and contorts so effectively. Everyone else is strong as well.
The plot holes don't matter to me either. Horror has dream logic.