I don't understand. Did you give the HD-DVD a 5/5 for "Visual Quality" or did you give that score to the SD-DVD? The reason I ask is because you mentioned how much edge-enhancement the SD-DVD had and that alone, should have brought down the perfect 5/5 rating consideriably, especially since edge-enhancement is by far, the most hideous and most distracting thing, visually speaking.
I don't doubt that the DVD looked good; I'm sure it would look great on my projector, but edge-enhancement (even just a tiny bit), destroys the look of "film" in my eyes. To me, whenever I see a DVD with EE, it makes it look like "video" as opposed to "film." There's a tremendous difference imho.