I don't see how it could be considered a poor man's polaroid, unless your camera can develop it internally or something. If direct positive paper is a polaroid, then so is slide film.
I do, however, like the idea of images that originate as in-camera originals without intermediates. I remember reading a website about an ULF photographer who shot in-camera Cibachrome positives. I always thought this was very interesting, and wondered if the positive paper could be used in a similar way for black-and-white.