I'm also disappointed. However, there are a few weird things about the numbers that make it seem like one week might not give a clear picture:
Uncharted 2's first week in America is 421k, while the first week in Europe is 360k. This is despite the fact that the PS3 install base in Europe is 20% higher than America, and despite the fact that the original Uncharted has sold to date 1.06M in America and 1.48M in Europe. It may be that Europe's second week will look a lot like a first week for the game, putting the European numbers above the American ones, and more in line with the pattern set by the first game. Finally, Europe's first week was actually only 2 days of data, while America's first week contained 5 days of data.
I think there are a few reasons to be hopeful about good legs. First, the game just went back up to 97 on Metacritic. If a review average can ever help sell a game, it'll help Uncharted 2. A 97 puts it into the stratosphere of PS3 games, with its only peer GTA IV at 98. Unlike GTA IV's backlash, word of mouth seems to be extremely positive about this game.
Second, the holidays are fast approaching and the PS3 is selling a lot better than it has in a while.
Third, the original Uncharted has strong legs.
