Paul Pillar, who served in the CIA for decades, blames its failures on bad leadership rather than bad intelligence:
Had Bush read the intelligence community's report, he would have seen his administration's case for invasion stood on its head. The intelligence officials concluded that Saddam was unlikely to use any weapons of mass destruction against the United States or give them to terrorists — unless the United States invaded Iraq and tried to overthrow his regime. The intelligence community did not believe, as the president claimed, that the Iraqi regime was an ally of al Qaeda, and it correctly foresaw any attempt to establish democracy in a post-Saddam Iraq as a hard, messy slog.
The Dish 