I don't think he is harsh on Howard the Duck at all, for one it is not an original work by him, it was based off a comic book. Also, I believe there was a Howard cameo during the podrace scene in The Phantom Menace, more evidence that he has nothing against it. I am not sure why it is not on DVD though. Probably has to do with it sucking, but then again that didn't keep Attack of the Clones from getting a DVD release, so I don't know.