Isn't the point of good sportscars to have unique character and good performance? This engine sharing sillyness robs the heart of one car and puts it as the heart of another. Where is the personality? It just seems like they are taking a Gallardo and slapping an Audi badge and soome nice new body panels on it.
That is clearly not the case - but the more that two performace cars have in common the lamer the copycat car is.
I think that is a mathematical relationship.