I don't see any problem with diesel cars, in the real developed world, they have been using it as a staple for decades.
As for the apparent Jetta that goes through a litre of oil a week, that sounds like a load of bull... if it's true then there is something wrong with THAT car, not diesel cars, i'm sure there are plenty of petrol engines that have that same prob...
and no i'm not a greeny and i dont own a diesel as a car, but i have a transit van in turbo disel and it goes more than enough... then the other cars are a 2.5l v6 turbo, a 3.2l v8 twin turbo, and a high reving 9000rpm 3.6l v8 so the carbon emissions I produce by myself off sets 400 prius's per minute lol