I think insofar as general intelligence is concerned, I think all games help to keep the mind somewhat sharpened, although no game can match the benefits of getting up and interacting with the real world. It's not just the physical action itself which helps to keep your body active and healthy, but it's the stimulation you get from the sun which has numerous influences on your neurochemistry. I imagine there're also many neurlogical benefits from interacting with other people face-to-face, as opposed to chatting with them online inside your cave. Those real life benefits will feed into the workplace and your smile.
I think games are a necessary evil, like many other forms of entertainment. If ANY real world learning can happen, even if it's just a factoid about ancient Rome or a elementary law of algebra, it's certainly going to be better than some completely imaginary digital goooo. The digital gooo ofcourse is always going to be in much greater concentration and numbers.
This link suggests the kind of game matters:
http://www.spacedaily.com/reports/Videogames_slow_reverse_mental_decay_study_999.html