The redeeming feature of the March 711 is that it was successful – Ronnie Peterson in a 711 was runner up to Jackie Stewart’s Tyrrell in 1971. It may not have been the prettiest car in the world but it worked.
Unlike the March 721X, which was extremely ugly and so awful that it nearly killed Niki Lauda’s F1 career before it got going. The thinking behind 721x was to reduce the polar movement of inertia by concentrating as much of the car as possible between the front and rear axle lines. It failed to work and was hastily replaced by the 721G – G standing for Guiness Book of World Records, relating to the lack of time to construct it.