I think Cosmo, that in the confines of a house, and the short distances associated with it, the shotgun has the distinct advantage of putting a number of rifle sized bullets within a 6" diameter area of the torso and cause the more instant damage also associated with a rifles hyper velocity which causes massive temporary wound path, but with the advantage of more missles hitting per shot. That's why many (not all) special ops units in MOUT situations still prefer the shotgun for clearing a house than an assault rifle. BTW, I forget who, I think Remington, has just come out with a new shotgun kit made specifically for the soldier in a MOUT situation. Obviously they must be responding to a much needed niche.
In ranges beyond the inside of a house, I won't argue that a rifle is usually going to be more suitable including in a MOUT situation in street fighting, as opposed to the house clearing of the shotgun.
The famous L.A shootout proves you right for that scenerio, for inside my house, give me a shotgun (even though my 10/22 will do a nice job too).