15 Cars That Defined the 2000s Published on May 7, 2020 in Galleries by Frédéric Mercier Pontiac AztekNo list of cars that defined the 2000s would be complete without the Pontiac Aztek. Considered by many to be the ugliest vehicle ever made, it was sold from 2001-2005. Remember the tent that could be attached to the liftgate?