Yeah I thought it was very good, but they are definatly childrens books. You could try them, the first one is good but a bit more for children than the other two. The last two in the series are definatly better than the first, and more grown up. The story is very different from the first as well, it is the same people but 5 years in the future.
They are probably sort of the same genre as His Dark Materials by Phillip Pullman- if you haven't read them and you enjoy the Wind on Fire, you will love HDM.
TWoF are better than Harry Potter too I think.