As has been mentioned already. If the roles were reversed, and Hamilton had done this to be on pole, you'd all be saying it was a masterstroke.
People here are just angry because it is Rosberg. You only have to read every F1 race thread here, to see the pattern.
You can't speak for everyone. As a Hamilton fan I'd feel the same way if he had done it. 'Slow down and be prepared to stop' is just not lifting for half a second. I want F1 to have clear, concise rules, but it's just a tombola at the moment.