I would like to write a review in the spirit of participating in a discussion about whether this book is "dated" and what, if anything, that means for today's young readers.
(Though first let me get out of the way the fact that this IS unquestionably a delightful book, as is the whole Ramona series up to this point. Cleary is a brilliant writer who has crafted a young protagonist who honestly and often humorously depicts the kind of excitement that most people only ever feel when they are young and the frustrations that are unique to that time in your life, as well. Ramona is a precocious, imaginative, aware, excited, frustrated child, and Cleary brings her to life with SO MUCH life it's astounding. This is all objectively true, and these are awesome books. So, there's my endorsement.)
Now on to the issue about which there is dissent. Some people are calling these books naive and picturesque, some are saying they are clearly set in Another Time, some talk about how unrealistic it is in today's economy for a family where both parents have to work to manage to have a mom who is still such a Perfect Mom in the traditional stay-at-home '50s sense, etc, etc. I would add that what come across the most dated to me are the mentions of Beezus' life -- i.e. the teen culture -- of Cleary's time. I think parents and young children actually have more in common across time than teenagers do, and it's Beezus' life that seems the most unrealistically wholesome and tame in light of teen literature now.
That said... I don't think any of this actually detracts from the value of the books for any young reader who is going to grow up to be a reader. Sure, short attention span kids who might occasionally tolerate a book but would rather play with their DS or watch tv might not love this book because there's essentially no material about technology or youth culture that resonates with them, and that's their primary criterion for whether something is relevant or enjoyable.
But real readers recognize at an early age, and continue to enjoy throughout their lives, the fact that books provide windows into different times and places, into characters who are not just avatars for ourselves in settings that are either identical to our own or so fantastically different that they are unequivocally Fantasy. Children still love fairy tales, which introduce them to more-or-less Medieval times. Children still love The Moffats, All of a Kind Family, Little House on the Prairie -- books set in the 1800s and early 1900s. The 1950s and '60s are rapidly receding and becoming the Unfathomable Past for current generations; but I posit that if anything, that makes it easier for children to appreciate books set in that era as being windows into a different world as well as being compelling stories about young characters.
When a period of time is just recently past, it becomes uncool to be "stuck in it" and not looking forward. When a place and time is as far past as post-War America now is, however, that is no longer the concern of anyone who would be on the lookout to criticize someone who is not adapting to the times. Those unfortunate sources of derision are now people who are stuck in the 1980s or '90s, not the '50s. In that way, I think the Ramona books escape being dated-and-uncool, and now are just books-about-a-cool-kid-set-in-a-different-time.
These books provide an opportunity to ask questions and learn and discuss what has changed in the world -- and why, and how, and whether that's all for the best -- if children want to have those kinds of discussions. But they are also spirited, fun, wry, intelligent works that can entertain children who want to enjoy themselves with books. Any child who knows what it's like to wake up each day with a hundred ideas and questions and things you want to try, and feels like the world is always telling you "No" or "Not now" will identify with Ramona -- feeling for her when "No" is the final answer, and exulting with her when she finds some very creative ways around it to "Yes."