Games are inherently one of the least efficient things out there, fun as -blam!-, but very inefficient. Therefore anything you do in a video game is inefficient so if you are that worried about efficiency stop playing videogames. You can play however you want, but please dont call it efficient.
Side note 1: (Unless of course you do reviews for a website with a lot of people reading and its part of your job then you guys are being efficient)
Side note 2: Cant wait to tally the amount of a certain phrase I get to hear now
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You can be efficient at achieving any goal It doesnt have to result in the production of something or material gain A highly efficient system get the desired effect using the least amount of work and waste So depending on what resourse (energy,time,money) has the most value gaming can be considered very effecient Very little calories used for several hours of enjoyment Its so efficient its making me fat