The way I see it is that unless you have done lots of driving courses etc and training your driving is only as good as your experiences and training. i.e. not that good really. As most folk drive cars that have power outputs that are within their capablities of handling they are for the most part ok. Give a punter on the street a 500bhp sports car and they'd be the same as the russian bloke who smashed up his SLS.
He is just an average driver, like me. Betcha if I had an SLS I'd overcook it and then not have the skill to recover it.
My mate was doing the exact same thing in an old e36 BMW 325i and flipped the car over twice with me in the car. We were very lucky, had something been coming towards us, and had the fence post come into the car 3 inches to the right, I'd be no longer with us.