I had a very similar reaction, actually. I finished it, flipped back through the electronic bookmarks I'd left, then promptly deleted it. And it's funny, because there are definitely grittier books which I revisit, even though that's really not my scene. In this case, I think it's part of what I referred to above -- we don't get the emotional arc like we expect. I mean, there's a nice ending with the puppy and dad reaching out in a mature, useful way, but it doesn't touch Christopher the way we anticipate, and so the impact is muted for us. And we don't get that pleasant little end cap which can really help a book with rougher emotional edges.

But yeah, that's exactly it: really glad I read it, never will again. Ah well. That's a sort of success in a book, I suppose, even if its not one I'd hope for as a writer.