Thats debatable, even when slitting someones throat, its not a quiet kill, theres a lot of gurgling, struggling, coughing, its not a pretty scene. The movies portray this sneak attack wrong.
Yeah, I guess I'll buy into the debate. I agree on what you said. That said, I wouldn't stab there. A good spinal shot to the lumbar section or an even better one to the back of the skull, near the vision center is the most effective. Less blood loss, more paralysis, quicker.