If you want to know how editors feel on the rare occasion they find a good book in their slush-pile, then read this lovely post from Making Light which compares the feeling to that moment in Britan's Got Talent when Susan Boyle began singing and Simon Cowell's usually-cynical face lit up with joy.
(What isn't mentioned in the article is the months of auditions that the Britan's Got Talent judges had to endure before they discovered Susan Boyle among the ranks of the hopeful. Because while the televised highlights make those auditions seem cringingly funny you have to remember that they are only the highlights. Most of the auditions are talent-free, embarrassingly bad, and just plain boring. Just like most of the stuff in the slush-pile.)