Focus = Fun. Not serious bit of engineering. My mates just bought an RS, he wanted a fast car and got a good deal on one. He is a big German car fan and never thought he would by a ford. But it not a serious car, as he has, you would buy it to have fun for a year and then sell it. Tis one of the most fun cars i've ever driven!
Some people say the ford ka is a roller skate. Personally i believe it looks like a shoe horn! Those things that assist your foot getting into a new shoe... thats the ka design brief!
My opinion. I owned a ford escort. I would never own a ford again, not after owning a VW. As an example the cam belt tensioner in a ford is a small nylon plastic wheel with a metal bush and a brass spring, prob weighs about 100 grams. I'm sure its sufficient. In a golf the cam belt tensioner is made of mild steel, weighs about 1.5lbs is full of steel bearings has no plastic parts and closely resembles the pullies they have guiding tank tracks.
Both these parts do the same job. Nuff said!