Understand that the term "Victory" has meaning that is farther reaching than just where it concerns Iraq. For my money, a victory would be locking the Iraqi borders, implementing Biometric Passports, monitoring who comes and goes with a fine toothed comb. NOT discussing our plans with Iran or Syria as they already know our plans (that's why they're so upset), and having enough manpower and hardware to crush the insurgency (not just spot check it).
The ISG is not a realistic approach on it's own, and setting a timeline is unreasonable at best. Thus far, we have not fought a war in Iraq. Our efforts have been what I believe to be half-hearted. Roots of this are in the fact that we do not view terrorism as an act of war but as a crime. When people describe this effort as not going well, they are correct. Think back to Gulf War 1. We initially threw all our best at it then came up short. Only former President Bush knows why we pulled up short but I suspect he knew that to depose Saddam would be an undertaking that would likely require his term and at least one other President's term(s). He also knew that to remove Saddam without serious consideration as to who/what would replace him/his government would open the door for Iran, the world leader in terrorism. Thus far, our efforts have been for all the right reasons. The level of our effort has been weak.
Anyone can look at a problem and comment but being critical without a serious alternative is worse than sitting quietly by and watching. Rumsfeld wanted to hammer the region and initially, I was hesitant but the more I learn and see, the more I wish we had just gone into this at 110% strength and really carried out a declaration of war. Victory will be achieved when Iran is slapped back into reality by an overwhelming force of violence. This, they understand.
My Father was a career lawman. He taught me that when I walked into a baroom brawl, my job was to find the "burr under the horse's blanket" and remove it. Well, in this case, the burr that is making the horse unridable is Iranian leadership.