They mostly pioneered the militaristic shooters, CoD 2 was fantastic and defined WW2 shooters, but their quality slowly started to decline, and now they're... This.
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Correction, call of duty pioneered on rails shooters with training wheels.
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So their original content was made more than a decade in the past.
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No they put multiplayer fps in the mainstream because of how simplistic and easy to get into the game was