Eh, my car has a finicky engine and I've learned that it's perfectly drivable without power steering or brakes. I've lost power while taking tight turns, and while it was a bit surprising the first time or two I had no trouble keeping it under control. Unless the driver has significantly less strength than the average person, or is unwilling to drop whatever might be in their off hand to get it too the wheel, I'd say it's more scary than dangerous.

That being said, I certainly wouldn't be happy if my new volvo did that; they should definitely be held to higher standards than my $500 beater.