The notion that people should just stop playing video games if some games are unrealistic is simply idiotic.
You implied that video games are intended for entertainment and thus if somebody derives no entertainment from them then there is no purpose in that person playing any video game whatsoever, that is flatly false because not every video game is intended purely for entertainment; some are intended as educational tools. In fact the very activity of human play itself evolved as a way for us to explore our surroundings and learn.
Furthermore you asserted, that because games are for entertainment, that a person should enjoy them regardless of whether or not they conform to his own personal taste, this is so absurd that I truly hope it should be readily apparent to any intelligent person who reads your post. Everyone has different taste, not everyone enjoys the things you enjoy sir, some people enjoy Little ponies and circus bears being fired out of cannons, some enjoy abstract art while others enjoy realism, this is true in any form of entertainment and art.
Using your logic one could argue that sense music is intended for entertainment, then anybody who does not enjoy Justin Bieber, because it is "just a tad" too bobble gum for his taste, should not listen to music.