That opinion is well founded. In the book American Icon by Bryce Hoffman (Detroit News journalist) he chronicles that entire time period.
Mulally pulled off one of the greatest challenges, a bonafide turn around. They had a company culture that was all about individuals protecting their own interests. Mulally changed it to one where they focused on making vehicles people want and thinking about the long-term.
For example, Mulally held a weekly executive meeting and each head would give a color coded report of their domain's status (green for good, yellow for issues, red for caution). For weeks in this meeting every single executive reported their status as "green" for good. This in a fiscal quarter when Ford had a $6 billion loss! Mulally managed to change that culture, which for anyone who has work experience should speak very loudly.