Halo! Or more specifically, Halo 2. I've been waiting for this game for a while now(about 2 years), and I have to say that it is one of the best games I have ever played. I hesitate to say the best, but it's up there. As a game, you'd expect it wouldn't take you that long to get into the real action, and it doesn't. Halo throws you into the heat of battle only after a few minutes of story setup and player calibration. The covenant are attacking earth, and your defending an orbiting space station, unaware that the amount of shit that's about to hit the fan can fertilize all of earth and it's other planetary colonies.
You're back this time as the Master Chief, an Enhanced Human Cyborg created from the Spartan II project. And there's a newcomer also! The first cinematic of the game introduce you to an Elite Commander, the very same Elite Commander that was the leader of the fleet whose ass you kicked in the first game. Well guess what, less than half-way through the game you are this character, known as the "Arbiter". As him you command squads of Elites, instead of platoons of marines or ODST's.
The game takes you from Earth, The ruins of the old Halo, a new Halo, a Covenant Holy City, and back to Earth again. The story, like the gameplay, is relentless. You rarely get a break, and the few times that you do, you know that there's something coming, something BIG. The suspense in-game, almost rivals the suspense waiting for the game... Almost.