Yep, I agree with all that. M4 too fast for the road, C63 (as the video says) a muscle car, but does provide entertainment without doing silly speeds. RS6 - I can only imagine it being a license killer.
I moved from the RC-F as I found myself having to spank it in order to get any fun out it. A very much under-rated car.
Regarding the video, I actually don't agree with many of the points.