Who said that you won?

I mean yes, you won the conventional war (truth to be told, Bush 2 would have been replaced with a mentally retarded Chimpanzee, the US would have won he conventional war anyway, there is no way the US could possibly loose a conventional confrontation with an embargoed 3rd world country), but a lot of things went wrong with the buisness of installing the appropriate vasalls or the process of turning Iraq into a nice satellite.
I see the point of invading Iraq from a Machiaviellian PoV. Irak was secular (so it should be easier to hold on for a non Muslim occupier), fairly educated (more exploitable human ressources), in a strategic position (always nice, means more competition though), rich in resources and split amog ethnic lines (should make divide and conquer much more feasable).
From a power point of view, Iraq can be seen as one of the better place to invade (one just has to fake a Casus Belli, whoops FAIL), what amazed me was the amount of trouble it made/makes.
I think any objective observer would count it as a win now. It was actually a win before the civil war etc. If our sole objective was simply to defeat a potential enemy, we should have left when Bush was on the "Mission Accomplished" carrier. Granted, we would have left a broken country, but technically it would have been a victory.
Having said that, our objectives went beyond simply removing Saddam and his capacity to make war. Especially for the neo-cons, the ultimate wet dream of a plan was that they flip Iraq to a going concern as a democratic country to be a "shining beacon on a hill" in the muslim world which would, by its very presence, foment home grown revolution or at least democratic reform in the region by the Iraqis showing how great it is living in a democracy. (Ok, I think they were smoking some really good weed when they thought that up, but.... I think that was their ultimate plan).
I agree with your "Real Politick" analysis of why we did it. That's pretty much what I've been saying since the beginning of this adventure. I NEVER EVER bought the WMD cassus belli. I don't want to be too harsh on those that did, but really you'd have to be dumb as a post, not so much to think that he did have them (since he used WMD on his own people), but that they posed any kind of a significant threat to the US.
We attacked them because of the reasons you state and because the coalition from the first Gulf War was about to break down completely. Aside from the corruption in the Oil for Food program which has been well documented, the French were desperately trying to get contracts back in Iraq, if I'm not mistaken Germany and Russia were also trying to get various contracts. In any case, the members of the coalition were putting pressure on the US and Britain to end the sanctions. Basically, the US had to shit or get off the pot. They chose to shit. Revisionists who now claim that there was an option to just keep the sanctions up are not dealing in historical fact. That was no longer an option by 2003.
Trying to get back contracts? Of course, precisly when did "moral considerations" ever stopped major powers like Russia or medium powers like Germany and France from doing buisness.
From Russia, Sadam could have been a potential asset against the more or less US satellites of Afghanistan and Saudi Arabia too, and having Iraq as a satellite would be an immense help to reestablish Russian control of the Caucasus.
Mind you, if the US goal would have been a bit more realistic, like "set up another random dictator with some token democratic legitimation as a puppet, hope that you wont have to invade again soon, make funny faces at Iran, than the whole thing may have worked.
The only examples were "forced democratisations" worked were Germany and Japan, and both had scores of differences.
To name some:
-The former gouverment systems of Germany and Japan were "univerisally reviled" after WW2. Iraqs Mudschahedin are at least morally supported by a significant part of the world.
-In the bipolar world following WW2, there was the common threat of the Soviet Union, today, the only threat potentially big enough would be the USA itself.
-At least Germany had a democratic tradition, several ancient Germanic tribes used democratic decision making processes, and German city states were republics nominally subservient to the Emperor. Bismarks Prussia also had democratic elements, as did the German Empire pre WW1, some individual counties like Baden also had significant democratic elements in their constitution.
I am no expert on Iraqi history, but I do know that no Empire in the area ever had something like "Free cities", and at least the Ottomans were, although quite tolerant in religious terms, hugely adversed to democratic ideas.