Great review. I watched the movie and loved it. My daughters did not want to watch it because an aunt of theirs told them it was a very bad movie, hard to understand, slow and boring.
It is really unfortunate that we don't have more movies like this one in every movie season. Our youth are growing up with a very simplistic notion of what cinema and a quality cinematic product is.
Roma is beautiful in every frame, every shot, every dialogue. It challenges the audience's attention and it makes us focus on details.
As in a poem, every piece counts, every element has been carefully chosen for dramatic effect and to move the story along, while creating ramifications.

Cuarón focuses on women's experience, putting men just in the background.

I would add that men are actually important in as much as they represent everything that is wrong with this world. They fuck things up big time; they disrrupt what may otherwise be a beautiful and harmonious world.
There lies the importance of childhood and there lies the importance of parenthood. Children have the potential to create or destroy depending on how they are raised and what constitutes their living records or emotional registers.