My favourite standard letter trying to disguise itself as a personal response

'Dear Author

Thank you for sending me your material. I am afraid that pressure of work prevents me from sending you a personal letter.

I have now had a chance to consider this and am sorry to say that although I found it well written and quite interesting to read, I didn’t feel strongly enough about it to want to take things further…'

I'm wondering if everyone gets a letter saying their book is "well written" and "quite interesting"? Even if it's utter crap? Or does she have different levels of standard letter?