I have to ask how is it possible to have 200% casualties? Isn't 100% the max you can have? I mean with 200% that like you killed everyone then brought them back to life and killed them again?
It's like when people tell you there gonna give something 110%. I think no your not, because that's not possible.
I also agree that defenders in MOUT tend to have the advantage for reasons already listed. Plus, urban warfare is very confusing and people get split up and isolated very easily. Communition has to be constant and things have to move rapidly and fluidly or things go to hell fast. Without the element of surprise its all in favor for the defenders.