There's just some things you need to use in order to understand, and I think the Oculus Rift is one of them. More so, the STEM system from Sixense is another, and so is the StrikerVR gun. OK, I'm done - just watch the video below.
Yeah, that's some next-gen gaming right there. A physical gun you hold in the real-world which has actual recoil, while the STEM is tracking all of its movements in real-time, while you're receiving everything visual through the VR world of the Oculus Rift. Sign. Me. Up. Also, give me Half-Life 3.