No mention of your support for the invasion of Iraq then?
I think anyone really interested in the Guardian's failings will learn more from Media Lens than any self-critical piece published by the paper itself.
Their books Guardians of Power and Propaganda Blitz examine the Guardian's output too.
(Disclosure: I'm currently the webmaster for the site.)
That said, even if you believe that removing Hussein was a worthy goal, the Iraq War was a colossal shit show.