In the same vein as
The Florida Project,
Roma really is more of a social commentary rather than a story. There is an explanation of the focus here.
Alfonso Cuaron reveals the hidden layers of 'Roma' - Los Angeles Times
Whether you view it as a commentary or a story, it's depressing. I can appreciate the great acting and directing, but I'm only halfway through it, and whenever I think about going back and finishing it, I always find something else to do.