Let's see......
1.) Iraq had no extensive Al Queda connections if any prior to the war starting.
2.) Iraq had no WMD's
3.) Iraq will more then likely fall into a Iran style theocracy lead by the Shiite majority.
4.) The Sunni minority who are largely secular for the most part hate our guts.
5.) Kurds if given the chance will bolt and form their own nation called Kurdistan and Turkey will declare war on this Kurdish state.
6.) Bin Laden is a couple hundred miles to the east of Iraq and hiding in the relative safety of the mountianist and lawless border regions of Pakistan.
I could go on and on.....
I only wish we could esculate the situation much further than it currently seems to be. What I mean is it would be good if we could conduct additional fairly large scale combat operations whenever our intellegence would allow it. We need to make it clear to the citizens of Iraq we mean to FINISH waht we started.
No one has ever one a popular guerrilla war. Not the U.S. not the former Soviet Union and not even Israel. You can't fight a army that does not sit still for you to punch it in the face and which is supported by and hides within the local populace. A large scale combat operation is only feasible if their are large targets to attack. In guerrilla war you concentrate on having small cells of soldiers reeking havoc on the enemy and his supporters from every single angle while maintaining as small a target as possible for the enemy to strike, aka "hit and run" tactics.