The book is so endlessly complicated by details of reference and information, the interim legends become so much of a nuisance despite their relevance, that the very action of the story seems to be to become hopelessly bogged down and the book, eventually, unreadable. . . . The manuscript of The Left Hand of Darkness is returned herewith.
http://www.ursulakleguin.com/Reject.html
New writers often collect stacks of rejection letters from publishers before getting their break in publishing, even those who become successful authors.
The moral:
See also CriticsAreYourBestFriends