Yes, we already knew about Pakistan's intelligence collaborating with the enemy. But did you know for sure that the Taliban were shooting down U.S. choppers with stinger missiles? I did not. I do now.
The only part of US society with any experience at all going into this in 2003 was the military, due to KFOR/Kosovo, and even that was exceedingly limited. Arguably, if the US had more experience in 2003, it might have been less willing to go into Iraq at all.
There were people who were just 100% anti-war in general, or anti Bush, or whatever, but because they were always screaming the same thing, they could be easily ignored -- kind of like calling every single death in a war murder, it degrades the term murder and makes actual murder much cheaper as a result.
Michael Yon (www.michaelyon-online.com) was probably the first to say things were actually going badly from 2003-2005, and then to document the surge and "awakening" which won Iraq.
No one really won (well, the Kurds, and maybe Iran), but sometimes making something really bad suck less is a victory. Given that the people who architected the turnaround were not the people who started it, I'd say they did a pretty good job with what they were given.
Why is that any sane person who dares to criticize the U.S. foreign policy is labeled as "traitor", when the true traitors were the congressmen who failed to check the executive branch, the intelligence agencies' employees who could but did not blow the whistle, and overall the American people who engaged in hysteria and madness and abstained from rational thought after the 9/11 attacks.
Yon takes good photos, and he provides some interesting stories at the tactical level. But he's kind of completely clueless about the grand plan. He's nothing more than a "useful idiot", cheering for a campaign from which he gains very little.
http://science.howstuffworks.com/stinger.htm
http://www.designation-systems.net/dusrm/m-92.html
And on general MANPADS:
Neither the Anza nor the Stinger (with the exception of the unordered Block II variant) could be regarded as superior to all other foreign MANPADs as both are handily outranged and otherwise bettered by newer fourth-generation MANPAD systems.
People need to get over the idea that any mention of a surface-to-air missile in Afghanistan must mean it's a Stinger. It's unlikely any of those ancient Stingers still work and the Soviet/Russian MANPAD variants were distributed so widely around the world that pretty much every two-bit terrorist has one these days.