Video games are fine for some people, but for nerd-like personalities they present far too great a temptation to supplant real life goal obtainment with virtual status/achievement. I think its helpful to make people aware of this tendency, and unhelpful to wave it away with a comparison to some more widespread non-nerd past-time like watching TV or sports.
How precisely do you define "nerd-like" personalities and what is it about them that is susceptible to having a "gaming disorder"? I feel like there's not much that would separate a gaming disorder from addictive behavior in general. So much so, actually, that to grant a special term for a video game related illness comes off as a little ridiculous.
As another poster (always_good) observes, there is a huge observable difference between video game addicts and substance abusers. I would not expect nerds to be substance abusers, and I would not expect substance abusers to be video game addicts, but everything about video games, in their construction of alternative realities and virtual goals and online communities, is like a glove tailored to the hand of nerd-dom.