I started this a bit of a joke. Having looked at a very great many of Pininfarina´s cars, I had to work hard to find this selection of duds.
Actually, I was reminded of a lot of very good concept cars which look great today and should have been made. Also, while the 1971 Pininfarina Ro80 concept has an odd decorative feature on the side, I am convinced this car served as eventual inspiration for a decade of Cadillacs and other GM cars in the 80s.
Take a look at this fascinating article from Drive, with a lot more insight on the 1969 Pininfarina Mercedes.