Moreta:good or bad?

HI!
I have read this book and i think it is good but the bad thing is thta the story has already been told in Dragonsinger:Harper of Pern. I think this spoils the story line as you know the end but it fills in a valuable part of Pern's history and it helps with the later books.

It is very detailed and i think it is good how it ends, but i dont think it is written as well as some of the other pern books. i would recommend it though even if just to fill in any gaps.