I've queried over a dozen short stories and lets see... four novels since 1994. I've submitted some of those novels over and over again after rewrites, but all I've accumulated is 595 rejections and 5 actual feedback letters. One time, in the late 90s, I got a request for a partial from James Vines, but he ultimately rejected it. The feedback letters were generally nice with good advice, but one was horrible and I wouldn't say that kind of stuff to my worst enemy.
Here is a partial list of my novel rejection rates so far:
The Greenhouse. Horror. +/-200 rejections. Zero feedback. Submitted in 95, 99, 2002, 2008.
Lusitania Gold. Action/Adventure. +/- 120 rejections. Zero feedback. Submitted in 97, 99, 2001, 2003.
Palmdale Gold. Action/Adventure. +/- 250 rejections. 5 feedback letters. Submitted in 2002, 2003, 2004, 2006, and 2008 (1 pending).
Meleena's Adventures - Treasure Of The Umbrunna. Fantasy. +/- 100 rejections. Zero feedback, Submitted in 2007, 2008.
I submitted a dozen short stories between 2002 and 2004 to Cemetary Dance, that all came back unread. I think they just transfered my submission and query to the return envelope and mailed it without even reading the query.
Tough market. The fact is, I've had agents at conferences tell me my query letters were fine, but they were just not interested in the story or genre at that time. Who knows what bothered the ones I didn't meet face to face? I'm sure some of my query letters in the 90's were pretty bad, but I got the response from James Vines with one of those.
Feidb