Shock and awe
was put forward as a means of causing the Iraqi regime to crumble immediately and surrender unconditionally. When that didn't happen, the war became "prolonged".
I think it will be a longer haul in the cities than a lot of folk were expecting. Precision guided weaponry doesn't buy much in door-to-door fighting. I'm sure the US will prevail, but the cost isn't going to be trivial, unfortunatley.