Not to be a total buzz-kill, but as my mom always told me: beauty is in the eye of the beholder and true beauty lies within. Since the same would apply for ugliness (even for inanimates…autos) asthetics will be subjective; but the truly ugly car is every one with a drunken fool driver within.
By the way, Stephen Colbert’s Stretch Hummer should at least be considered for Miss Congeniality.