What is "content?" The content of a game is the gameplay it provides. If you play Battlefield for 1000, then it offered you 1000 hours of content. The fact that that content is spread over a handful of maps is irrelevant.
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Content is what is in the game, if a game has 12 hours of content no matter how much i replay it it's still 12 hours.
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Then by your definition all FPS games have about the same amount of content.
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Yes... they do)