There are rumors that say that rejection letters are brutal and impersonal. In my experience, agents do read through queries and sample chapters. There is no reason for them to be personal in their rejection letters with the hundreds of queries they receive a week, sometimes even in a day. Yet I received rejection letters such as the following:
"Thanks for sending along the pages of your manuscript, 'Facades'. Truth be told, though, I'm afraid these pages just didn't draw me in as much as I had hoped. I'm pressed for time these days and, what with my reservations about the project, I suspect I wouldn't be the best fit. Thanks so much for contacting me and for giving me this opportunity. It's much appreciated, and I'm sorry to be passing. I wish you the very best of luck in your search for representation."