My kids, ages 3-6, really love this book. The little monkey wants to play with his mother, but she is busy doing monkey-housework type things, and then resting, and keeps putting him off. In the meantime, he gets bored and into trouble, and eventually she loses patience with him. In the end though, she apologizes, and says she loves him always, and they play happily together. Both the story and pictures really engage my children, and I always reinforce after that I always love them, even if sometimes I seem 'grumpy' or sometimes they make 'mistakes'.
For me, the value of stories is partly about helping kids process different emotional experiences, and so I think the story of this one does that. Of course, if you never lose patience with your kids, maybe yours don't need help processing that one, lol:-)
As for the critical review here, I first off don't really agree that all the actions of the 'little monkey' in this book could be considered accidental. Some are and some aren't. Mostly he just seems bored, so again, I think this book offers a good opportunity for discussing how to deal with boredom, how to play alone, and how sometimes Mommy (or Daddy, or Grandma, etc.) need to do other things. It also offers the opportunity to discuss what is 'on purpose' and what is 'accidental'. In short, it is just a fantasy version of something that honestly occurs in many households every single day, and this offers a wonderful and fun way to air that out, and reinforce the message that love trumps all.