I came across this new video on TechBugTV today. It shows two different screen modes on the PLAYSTATION 3, one being Full RGB and the other being Limited. All PLAYSTATION 3's are set to limited apparently.
Sites like GameTrailers always show the PLAYSTATION 3 version of the game as washed out. This video claims its because they have their settings wrong, and the screen should be set to Full RGB with Super-White on. The difference in Assassin's Creed really does show.
I'd confirm this for you, but I'm on vacation as of now and visiting my father. So perhaps you guys could confirm this?