Gizmodo has a great blurb about it:http://gizmodo.com/5877075/mass-effe...-a-good-reason
the following are only excerpts. for the full text, go to the aforementioned link:
"Mass Effect 3's Kinect integration is drop-dead simple. It's simply voice. And it's really simple. You shout commands to your squad mates"James! Frag grenade!"and they follow your orders. You can instantly switch to whatever weapon you want or activate whichever skill you want to pull out of your bag of tricks. Or you can just open a door. No menus, no buttons, no pausing the game play. Fluid, simple, and most importantly, natural
. Kinect with Mass Effect 3, while optional, doesn't feel like a bolted-on gimmick. It feels right. James, move your ass and kill that guy
"The genius of Mass Effect 3's voice commands is that they both radically simplify the game's controls while simultaneously allowing more complex gameplay action than ever before."
"A somewhat major change in gameplay thanks to the Kinect is that the start-stop-queue-and-attack turn-based rhythm of the old Mass Effect is obliterated by the stream of constant, real-time commands coming out of your mouth. The gameand you and your partynever stop moving. It's more immersive not just because you're yelling at your party members, but simply because you never have to break the cinematic game play to jump into an abstract menu to switch guns or tell a party member what to do next."
"For all the excitement about what Kinect brings to Mass Effect 3 gameplay-wise, what's potentially more exciting is the very real possibility that in the next year or two, we might look back at Mass Effect 3 as a watershed momentthe game that brought Kinect to gamers, that broke it out of the motion-control-gimmick ghetto. That made a Kinect-powered Halo suddenly seem like a real possibility, and for all the right reasons. I hope so, because it feels like something that's just the beginning."
note that the guy apparently hasn't tried Halo Anniversary with the Kinect which I found the integration useful for some things.
here's the video that someone camcorded from the dash:
here's another different video: