Bungie's smooth and polished implementation of the well-trodden online shooter formula proved to be the judges' pick for 2007 - and it's well earned. What other game has such a fully-featured replay mode? What other game comes with such a variety of maps and game styles? What other game gives you the chance to be teabagged by a pre-pubescent boy with a potty mouth? Hang on, that's not right.