10 most disappointing cars of 2011

Smart is still trying to prove that a funny-looking two-seat car that is challenged at highway speeds and gets mediocre gas mileage will appeal to enough American buyers to constitute a business. Superdealer Roger Penske threw in the towel in February when he returned his exclusive distributor to corporate parent Mercedes-Benz. A new battery-powered version probably isn't going to charge up sales, which fell to 467 in April.

NEXT: Toyota Tundra