I initially read By the Bog of Cats to write about it in my dissertation (I've now written that chapter), but it took me a while to get to the other plays in this collection. I really love By the Bog of Cats, and I liked Portia Coughlan, but I found Low in the Dark and The Mai difficult to follow. Especially with The Mai, I think if I saw it performed I might understand it better, but it didn't seem to me like much of anything happened and what did happen seemed rather random.
Across these four plays however are some pretty consistent themes, especially issues of motherhood, marriage, and depressed women. My sense is that before Carr, these types of concerns had little place on major Irish stages, and it was really Carr's drama that began bringing female voices and issues to the forefront of Irish theatre.