Summary: Uncharted was the first game I bought when I got my PS3, and it's been the benchmark all games I've played since have been judged by. It had very cool shooting/platforming gameplay and an engaging storyline, as well as significant differences in the difficulty levels making it well worth replaying. That being said, I generally don't expect much out of sequels and went into Uncharted 2 with some skepticism. How wrong I was.
Summary: A truly fantastic sequel to "Uncharted: Drake's Fortune". If you have never played the first one it really doesn't matter as the the actual storyline is a new adventure. The story itself is memorable as are the twists. This is the closest you're going to get to an Indiana Jones game (or even a decent IJ 'movie' after the last pile of cr*p). I love how everything moves along without any heavy loading screens to take away the immersive quality of the gameplay.
Summary: The first thing you'll notice when you start the game is the graphics. The improvement from the first game is just unbelievable. Also, I won't spoil any of them, but there are sections in this game that are so brilliantly designed, everyone should see them. I recommend this game to every PS3 owner.