The invasion wasn't a blunder. Tying Rummy's hands was a huge blunder -- but we don't need (ex)President Blunder in Human Form telling us about it.
Ah no that would be another media manufactured myth about Iraq. People really need to learn the diffeence between Counter Insurgency and Conventional War. What would be a blunder would be to use Conventional War doctrine to fight an Asymetrical War. The Russians followed your doctrine in Afganistan. How did that work out for them?