If you are an avid author, you might well have submitted manuscripts for publishing as a book. It is a strange fact that the acceptance of a manuscript is really no measure of quality, it just means that it meets the criteria of the particular individual judging it.
Watership Down, a famous book that was made into a movie, was rejected many times before being accepted.
My point is that you perhaps should not solely rely on others to judge your work, just because their job title involves working for a publisher. There are many people working who make errors, and lots of working decision makers who have little commonsense.
So, how can you bypass this system that might fail you? Simple, just go ahead and publish your book yourself.
Self Publishing is available for far less cost than it used to be, and one of the leaders in this field is authorhouse.com - well worth a look at their website. Before spending your money though, it is good to double-check your writing, and maybe have some friends or even better, acquaintances look at it and give an honest opinion. Remember, the whole idea is to make sure your good work gets published, so you can move on further with it.