Microsoft's desire to keep grot away from PCs is understandable, but humanity's predilection for violence and mayhem means that a majority of triple-A titles launched today meet PEGI 18 or ESRB Mature guidelines - banning games such as Dishonored, Call of Duty: Modern Warfare 3 and Bioshock from being sold through the store in Europe thanks to PEGI 18 ratings, despite their lower ESRB rating meani