2001 sales: 5,304
2009 sales: N/A
When General Motors unveiled the Pontiac Aztek concept car in 1999, it looked like a fun, sporty ultra-modern beach car.
Then something terrible happened on the way to production. Attempts to maintain the concept car's general appearance while making the vehicle roomier and more practical resulted in a vehicle that was, indeed, practical, but looked all wrong.
"Apparently, nobody stood back and took a look at it before taking to market," said Edmunds.com's Smith.
A sales dud, the Aztek ended production after the 2005 model year. The legendary Pontiac brand, sadly, fared little better. Facing bankruptcy, GM killed it this year.
NEXT: New Kid: Chrysler PT Cruiser