Game Informer - Call of Duty 2 kicked off this console generation when it released alongside the Xbox 360, and the series has been an annual juggernaut ever since. This sustained popularity has put the series in a tough spot creatively, as drastic changes to the formula might turn off longtime fans. With the first Black Ops, Treyarch demonstrated it was willing to take risks by shaking up numerous multiplayer conventions. Fans loved the new features, and the developer has shifted its focus to campaign changes for Black Ops II. Some of these risks pay off, and others are faulty despite their ambition.