Team Fortress 2: Class Warfare
Valve's goal with Half-Life 2: The Orange Box is to offer a great single-player title (Episode Two), a unique gameplay experience (Portal), and an awesome multiplayer game (Team Fortress 2). From our play date at Valve, it appears the legendary company will be able to deliver on all three aspects. While Episode Two is one sweet shooter and Portal is the next evolution in puzzle games, it's Team Fortress 2 that proved the most impressive.
Team Fortress 2 is a fast-paced class-based online shooter. Valve's challenge in reviving the long-dormant TF franchise was creating a great experience no matter which of the nine classes a player chose. Along with making each class visually different, Valve managed to infuse each class with its own personality. Each requires a different type of strategy; but all nine classes are useful. And, more importantly, each is fun to play.