I regret to say that I don't feel that I'm the most appropriate agent for your work.
However, opinions vary considerably in this business, and I wish you the best of luck in your search for representation.
Nothing in there to piss me off too badly really. It's polite. It lets me down gently with the whole subjectivity thing. Hell, it even wishes me luck. Not once have I read a form rejection and wanted to explain my novel any further than I had already done in the query letter. Not once have I had my reading interrupted when I realized that what I was criticized for in a rejection was now happening, right on the page, of the book I was reading.
Take my current Newbery Honor read over there on the right. A Long Way From Chicago by one of the Pecks who writes kids' books is "a novel in stories," which basically means it's a bunch of short stories starring the same characters. The stories are funny. The novel--if you can really call it that--is historical. But it's meant to be a kids' book, and while the stories are told by the boy, the star of the show is undoubtedly the boy's grandmother.
Now I wouldn't normally care about this but for the fact that an agent who rejected my current young adult manuscript cited as one of its weaknesses too much of a focus on the adults. I thought it a valid criticism--until I read A Long Way From Chicago, a book in which the two kids do pretty much nothing except witness the exploits of their no-nonsense grandmother. So I guess the lessons are these: Agents, just send along the form rejection; it's far less painful. And make sure you mention how subjective this business is, because...it is.