Rosberg admits ‘danger’ of stalled career
The German driver, who failed even to graduate through 'Q1' with his Williams in Shanghai, will also stay with the Oxfordshire based team next year.
But he admits that, in the fickle F1 world, memories of sensational promise are short.
"A certain danger exists, because the quality of the driver, in the eyes of others, is closely connected with the achievement of the car," he told Germany's Frankfurter Allgemeinen newspaper.
"Jenson Button is a good example," the 23-year-old continued. "For me, he is still a really, really good driver.
"But his market value has gone down hugely since 2004", when he was third in the championship behind the Ferraris, Rosberg said.
He admits he has been "very disappointed" with his 2008 season.
"At the beginning of the year it looked very good. I was third in Australia and expectations for a good season were high. We were better than Renault. But we have probably just done a bad job.
"Particularly with the development of the aerodynamics we have not kept up," said the forthright driver.
"For some years now Williams has had problems with the development of the car during the season. But it is excusable because we have learned so much."