"The Perfect Storm" is one of a handful of HD-DVD's (and Blu-ray's) that Warner itself acknowledged were made from a 'bobbled' 1080i master that wasn't the most optimal source. The first two "Lethal Weapon" flicks, "The Fugitive," "Enter the Dragon," the white cover/helmet version of "Full Metal Jacket" and another two flicks I forgot were also affected by this '1080i bobbling' mistake.
"Traffic" jumps out immediately to mind. Same mistake as the 'bobbled' Warner masters except the master was 480! You are literally getting the same rez on DVD as you do with the HD-DVD.
"Spartacus" is also a pretty underwhelming high-def title that, unlike good transfers of old films like "Casablanca" or "Forbidden Planet," looks every bit its age.
"The Sting" has a handful of really cool shots (mostly interiors) but most of the film doesn't look better than upconverted DVD.
"An American Werewolf in London" and "Animal House" (both John Landis movies) look rough and slightly improved over their SD versions because the director wanted them to look 'dingy' all along and not crystal-clear. The transfers were deliberately not optimized at John Landis' request!
For more info/opinions about HD-DVD's best and worst-looking titles go here: http://www.avsforum.com/avs-vb/showthread.php?t=942015