I personally have no problem with the trike-based vehicles that lean into a corner such as Piaggio MP3, the Lazareth or Neo Wing that dutchinterceptor mentioned. I have personally wished many times to have a go on a Piaggio... I suspect you could bomb the hell out of a corner on one.
I have no interest in the "flat wheeled" trikes and would personally never own one as long as I have both my legs. For those with physical limitations, I think it is an acceptable solution. But I think the "leaners" would be the perfect solution for those with limitations, especially if the side-by-side wheels could be automatically locked upright upon approaching a stop.
Wherever your tastes or proclivities lie, I feel it is pretty small-minded to lump everything with more than two wheels together with "just buy a car". I would love to have a further explanation as to how you feel the Lazareth and a "car" are comparable vehicles?