http://www.youtube.com/watch?v=xxf1c3fzDOU
Youtube video which shows a lot of behind the scenes perspectives from pre-production and actual production. I watched this last night and came away completely understanding why the prequel trilogy was doomed from the very beginning.
You can pretty much sum it up with the quote by George Lucas of "Jar Jar is the key role" towards the beginning.
The very end of the video is downright sad when you can see in George's face and hear in his voice that he realized he (hopefully temporarily) broke Star Wars.
Enjoy.