In 2003, Activision introduced "Call of Duty," a World War 2-themed FPS that audiences loved, but GameSpot cited a lack of innovation in the later sequel "Modern Warfare 3," IGN pinpointed bad AI in "Black Ops 2," and Eurogamer was unimpressed by the story in "Ghosts." Critics also have derided the latest entry, "Vanguard," as the laziest and buggiest installment.