Don't forget that the real message behind the coating is that BD will be highly sensitive to any dust or smudges of any kind, scratches included. Stuff that you get by with on a DVD will not be acceptable to BD. With a lower data density, HD-DVD will not have as many issues.
Being the local BD curmudgeon, I just wanted to point out again that BD has several issues that have yet to be worked out, and playback issues are but one.
Coatings sound all fine and good, but the bottom line is difficult playback with anything but a pristine disc.