I am sorry...but WTF? Killer Instinct hasnt been reviewed yet and Kinect Sports is not Rare its Microware.
I forgive you.
The new KI isn't a Rare game per se. At best, Rare is watching over the project.
Kinect Sports is indeed a Rare game. It was developed by a studio called Rare.
Now breathe a little and feel free to respond. You seem cranky today.