aside from the rest of the seemingly endless list of special conditions Kinect needs to work, I have creaky floors in my apt building, as does every 20 something living in relatively older buildings in New York, Chicago, Boston, etc. I would get destroyed by my neighbors and landlord after an hour or two of playing anything on this. I would rather reserve my "making a fuck ton of noise" nights for sex.
Despite all this, this thing will probably have strong sales because the world sucks at life.