Half-Life 2

The Good
The game makes you feel like you actually live in the world. You feel you are Gordon Freeman, not someone punching keys watching someone move. The environment is so life-like, thanks to the Havok Engine physics, that you can do almost everything you would do if were inside this universe, from moving objects to using whatever you see for achieving your goal. The graphics are truly amazing. Maybe not as life-like as the Unreal 3 engine demo shown in E3, but the best there is out there today. The sound is equally impressive.

The Bad
There are just two problems you may or may not face. The sound shuttering bug, which is fixed by now (though you still may face it once in a while), and the fact that the loading times can be long which somehow affects the immersion effect. Other than that, it is perfect.

The Bottom Line
The most amazing game ever released.