In my opinion ATC in the US is far and away the best in the world. Europe is getting better but they have a long way to go in the efficient movement of air traffic. It wasn't all that long ago that when flying in Europe you had to have runway slots, departure slots, airway slots, arrival slots. You would finally get all your ducks in a row; hurtle into the air and be greeted by an erie quiet. Hardly any traffic! The Americans understand and use aviation better than any one else on the planet. Lighten up guys.