[petrolhead611]

Worst is a tough contest.
Maybe the Austin A40 Farina that rusted as you looked at it.
Or the Berkeley B105,my first sportscar that accelerated and cornered well enough to beat an ex-works Mini Cooper to the university perimeter Road lap record( after which exploit the authorities put in speed bumps) but suffered scuttle shake like you have never imagined, was a maintenance hog, and so badly engineered it should never have been allowed on the road
The Morris 1000 van which despite having only 28 bhp suffered axle tramp when accelerating away from rest,and had the brake master cylinder in the chassis frame.When that leaked I sold it rather than attempt to put a new one in.
Or the Renault Extra Van that got through clutch cables every few months because of a design fault.
But, the best car was also a Renault,a petrol engined 1990 Espace which I sold still running well after 450000 miles but which I had maintained well from new.That thing was used mainly as a van,loaded to the roof with merchandise, or carrying my prokart, and driven hard for very long distances almost every day for 9 years,in comfort.I got my money's worth,thats for sure and enjoyed driving it when not loaded up, as it handled very well.