Interesting. One is an (almost ridiculously) high powered sports car, owned primarily by people with more interest in image than driving ability. The other is a relatively tippy, but perfectly sensible front wheel drive sedan with a "hot hatch" variant. Now I have zero statistics with regards to either car flipping, but I'd bet dollars to donuts that between the two models, at autocrosses (where the image concious Corvette owner is more likely to be in the minority), the Focus would have higher flip numbers.

There's no sense being offended by it, it's a simple fact that taller shorter wheelbase cars will tip more easily than lower longer cars. The Focus falls into the former category. It doesn't make it a poor performer or an unsafe car, it simply means that its capabilities are not going to be as high as cars built with a narrower purpose. Also if there was indeed a rear suspension jacking issue, it is probably limited to the earlier models, the car was after all not initially targetting driving enthusiasts.