A new Mercedes-Benz ad starring the voluptuous Kate Upton is generating some surprisingly negative buzz in the blogosphere, with critics calling it cheap and tasteless—even wondering if it's too sexy.

"Hot girl, great car, and somehow I think this is the worst ad Mercedes has ever made," and "Cheap and stupid. Worst ad Mercedes made. Whoever thought of this needs to be fired!" are among a slew of choice comments posted on the Mercedes-Benz Facebook page.