I thought PS3 fans always said sequels aren't system sellers and always do worse then the original. (This was around the time of the launch of Gears of War 2).
On topic: I think Uncharted 2 can be the system seller that Uncharted 1 wasn't, it just needs heavy marketing and don't show close ups of people in the ads, just show the amazing environments. (which is where the game really shines).







