Say what you will about any of the "personality type" analyses out there, but being able to categorize an individual can help to understand them. Whether it's Myers-Briggs, Enneagrams, or the 5 Love Languages, being able to relate to a grouping that helps explain a personality is a great way to find an identity. These may all be pseudoscience, but they're harmless if used in the right ways. The 5 Love Languages of Children helps identify how these personality traits show up in kids.
As a parent, I found this book immensely useful because it revealed what the major (and minor) love languages of my two children are. Knowing how to best fill their "love tank" has helped my wife and I to manage our time with our kids. Knowing how these love languages may change as our kids grow up is just as useful as knowing that they need some of all the types (Gifts, Words of Affirmation, Quality Time, Acts of Service, and Physical Touch). After all, parenting kids who feel loved seems to be a much easier task than parenting kids who feel neglected.
With this personality type analysis, there's always a caveat. No single individual will fall entirely into a single category, and these categories may change over time. Still, it's fun to see my kids light up when they receive the love language they most identify with. Not only do I feel the 5 Love Languages are useful in understanding ourselves, but knowing how others (i.e., our spouses and children) receive love is important to growing these key relationships in our lives.
A useful tool to help parents love their children more effectively, I give The 5 Love Languages of Children 4.0 stars out of 5.