I think listening to other people's opinions as to what is to be considered "sad" is "sad" in a way, and I *don't* mean that in a derogatory way.
What I mean is, only YOU can decide if the level of gaming you are doing is sad, don't let anyone tell you. If gaming is what you like, what makes you happy, then game all you want. However, if having a fulfilling life is what you want, with a job, friends, health, social life, relationships etc. and you let that slide or get out of control because you are gaming too much, then yes, that is sad, and that's when you need to do something about it.
If you just happen to love gaming, and you are getting what you want out of life, don't let anyone tell you if it's sad or not. I will never judge anyone like that. Sure, I may not hang out with them, but I will never say they are sad, just like I wouldn't call a shallow gym junkie who only wears designer clothes sad, as long as he likes what he likes and is happy.