This was the first EL book to be released since a number of us joined up here and therefore received a lot of extra scrutiny, criticisms, ect. Gregg even sent out a few AREs and challenged us to write reviews. You can tell we aren’t all that great at writing reviews, but there were a few fine efforts.
The uniqueness of the story (you mention) may also have contributed to the luke-warmish reception. Now over three years later I find it difficult to place this one on any kind of likability scale compared to other EL books. If fits right in with all the rest.