In a nutshell: One of the most highly rated games of E3, Gears of War is looking likely to be the Xbox 360’s Christmas blockbuster with the best graphics yet seen on the system and a tactical twist on the usual shoot ‘em-up gameplay.   The lowdown: With Halo still at least a year out this is currently the Xbox 360’s premier exclusive shoot ‘em-up. Using a third person, over the shoulder, view rather than the usual first person viewpoint the game emphasis the impo....