"I met with Mr. [Jeff] Kleinman a week ago at a writer's conference in Indiana to pitch my novel. He told me the idea was good but the book was not ready to be published. Although, this was a rejection, I valued his advice and after he told me what to do, I agreed and found the information helpful.
I think writers fail to realize this is a business, plain and simple. Agents may like many of the books they look at, but they only have time to represent the ones they love. I don't like form letters, but they are a necessary evil if an agent receives hundreds of query letters a month. Because really, when would they have the time to represent the authors they do have and make the money necessary to live if they spent time writing individual letters and going into depth about why they won't accept your manuscript.
It really comes down to this: if the idea and the writing don't absolutely wow the agent, they will not accept it. So you fix the problem, continue to learn, send a query letter to another agent, or you give up. But nobody has ever said that getting a book published is easy. Otherwise, everyone would have a story to sell. This career is only for those who don't give up.
Thanks for news flash about nothing we didn't already know, buddy.