I have a story for this one, it is depressing, and not how everyone is, but how some people really are.
I have a friend, lets call him Tony. Mostly because I have no friends named Tony and some part of me thinks that would be cool. Anyways, on topic, he plays video games his entire time off from anything. It is what he does, it is his hobby. Note how I'm ignoring the words "because it is fun", there is a reason for this. See, his life is, even I'll admit from my own low ass standpoint, crap, mostly for long term reasons that won't go away anytime soon for him. Because of this, he plays games to escape reality. Nothing new, I do the same, as do more than a few here I imagine. Thing is, he doesn't do it just to escape, he does it to replace, reality. How is this different? When he loses at a game, it isn't the "lets try again" reaction, it's the "as if life wasn't bad enough" emo rage reaction that would make a siren cover their ears and has made the stereotype XBL emotionless twelve year old cry. The vitriol that this man spews because he is using the game not for fun, but a replacement for his crap-tastic life, has actually made him not able to see his nephew for a while, because the kid beat him at Mario Cart once, and he just went off verbally.
I share this mostly because if there is anyone else who has lost the fun in videogames for a similar reason, please, look at your life, and try to understand that replacing it with a game, that you can and will lose from time to time, is generally a bad idea.