I liked the book. It was a neat continuation of the series, surprisingly dark at times, and left me interested in reading the future volumes to find out how it ends.
The "romance" aspect is unforgivable though, but minor. Aang and Katara only know one pet name, "sweetie", and say it every line they're in the same room together. But I didn't mind it -that- much because every single other character hated it as much as I did and called them out. Worth it for Toph alone, really.