Fight Night is arguably the perfect fighting franchise to Kinectify. Not only is it far less frantic than the likes of Mortal Kombat and Street Fighter, but players also occupies the 3D game world but are rooted in place ducking and weaving for the most part.
Of course you can also move freely around the ring as you face your heavyweight opponents instead of standing awkwardly side-on to your Kinect and getting the snot punched out of you.
The issue with bringing any fighting game to Kinect is proper, tangible feedback. It's all well and good punching air but nothing will take away from the fact that you're... well, punching air.