I believe the aspects of gaming does ruin peoples lives, but there is also aspect where its your own self-control that is lacking, when playing games, which in essence is yourself causing the "life ruined" aspect.
Firstly, the fact that we have games to play, sets that first step into gaming, and wanting to be on the computer. The constant advertisement, and benefits they try to throw at you, luring you in etc.
But the fact that you decide to play games, and play too much of it (which is always the main cause), relates to why gaming can ruin peoples lives. There's a primary and secondary source. Games are Primary, we are Secondary.
I think as long as your health is maintained, because a lot of gaming does/can ruin peoples lives from a health aspect, from the wealth aspect, (debts), the obsession to be better then others in a game, constantly staring at a pc, causing eye problems etc. Although sometimes people who have health or mental issues, feel like they can escape and play a game, to not have to always focus on the real life, so if you think about it, for some people it can sometimes help.
To be honest, thinking about it, I'm undecided, I believe it depends on specific and individual cases.
I also agree that socialisation is not decreased while playing games, firstly I learnt much more growing up, with my English, simply grammar etc, and general knowledge participating in forums like so. Also with that, you can learn different cultures, languages, personalities, and much more from socialising within online games, its not every day that you can speak to someone from, UK, France, Netherlands, USA, Canada, Australia, Germany, Sweden, Pakistan, Indian, Japan, China, in the space of 5 minutes.
Gaming has its upsides, and downsides, it may just be about self-control.