My three-year-old daughter loves superheroes, so the stories held her attention for quite a while. As the bumf inside says, the subject matter motivates the kids to read. Some of the words are a little long for young children, but they can recognise and point them out, even if they can't actually read them yet. The 'books' (pamphlets) are short, but it means they are not too daunting for the children. I couldn't help but feel a little ripped off by the empty box inside the packaging to make it look more substantial.
Overall, I would say for the price, if the child is interested in Batman, this is worth a try.