Ali's excellent blog explains:Free Iraqi: Asking few questions makes a difference.
After Saddam was toppled most Iraqis took a sigh of relief, "Now finally someone sane is going to run things here". They did think of America as a sane power totally replacing a mad one, at least for a while. I say they were relieved not just because they got rid of Saddam, as that meant incridible joy not relief. But It's been also a relief because it was scary to think that your fate is in the hands of an insane man while you can't do anything and you're not even used to such a huge responsibility.
But the Americans did not want to replace Saddam. They did not want to run things the way they wanted without sharing the responsibility with the people, even if they thought their management could fix things and even if this was for a transitional phase.
An iron evil fist was gone but it was not replaced by an "iron good fist" as many Iraqis wished, and things collapsed in a place that has been ruled with extreme force for decades when people were given freedom.
This is one of the main reasons why many Iraqis were and still are disappointed with America. No, these Iraqis do not hate America as most like to think, they're just disappointed with her for not fitting the image they had in their minds; the just tyrant that should've taken full responsibility for some time until they could find their own just tyrant who would make their life much better without forcing them to share a burden and a responsibility they never thought it was among their duties as citizens.
In the same sense, many Iraqis looked for the January elections to bring the long awaited Iraqi savior even if it meant many saviors not just one. They saw the advantage of multiple leaders/democacry and welcomed it but did not expect that these leaders would have so many differences and find a huge difficulty in agreeing on a common major goal.
h/t: Musings of a fat kid