This sort of question is basically forcing me to be rude to you. I either have to delete it with no response, or I have to give you an answer that you are not going to like. Probably "Because I don't like it." or "Because it isn't well-written." or "Because it is OK, but not good enough." To be more polite would just be reiterating my original polite rejection. And who cares what I think, anyway, if I don't like it, find somebody who does!
If you've sent one of these plaintive emails, I am sorry, but I just have to delete.
And here is my lengthier post from earlier in the year on the very subject of rejection.
