727bhp is also ridiculous in the hands of someone incompetent on the road - eg my dad could go out and buy one but would I want him too?? wouldn't want him behind the wheel of something so powerful
Could say that for any car really depending on the person but surely a line must be drawn at what you can buy based on your experience/ licence/ tests (which arent available) etc...
I had a decent drive at the weekend in a DBS Superlegerra, which is 715bhp but comes in closer to 1900kg so fair bit lighter than this M5. It's a lot of power for the road yes, but equally, modern traction control systems really help rein it in - along with torque limiting in 1st and 2nd. My biggest gripe would not be that it's 'too much' power for a road user, but that a lot of it is redundant because unless you have an empty Autobahn type road, you'll likely never get to wring it's neck properly. Stretching 3rd out to the redline in the DBS takes you well into license losing territory.
My M4 is obviously not in the same power league but nonetheless, it was one of my arguments on a recent podcast about why I'm tempted to go down in power when I sell the car and get a hot hatch or something like that instead - as it will be a bit more useable on a lot of roads.