No this is good. What the US is probably doing is pursuing a strategy of dividing the ME along ideological lines.
What looks to be happening is probably going to be the absolutely best outcome for the USA in this titanic struggle. What if Baghdad was partitioned completely like Berlin? Just put in short term martial law and build the wall separating Shiites and Sunnis. Fast forward 5 years, 10 years. We are still working like mad to bring up the western side of Baghdad and western Iraq. The Shiites and their dirty faced Mullahs run the east. You'll no doubt see razor wire and people trying to get out of the eastern district (just like in Berlin) to make a break for FREEDOM. That's a decent calculus for our side to explore IMHO.
That's been my idea all along, Baghdad just like Berlin in 1946.