We used them as free reading or occasionally a family read-aloud at lunch (not for literature, just for fun) when my kids were younger. As leisure reading, I believe they are good quality. The Ramona Quimby series and Henry Huggins series offer some good old-fashioned family values, both parents are featured throughout the stories, responsibility and chores are woven into them, and the kids are just kids.
To me, Cleary’s children’s books are kind of like the Beverly Lewis books about the Amish people are to me. Sometimes, I just want a light read that is well-written and clean, just something about ordinary people.