Not typical, but not entirely unusual. It just sounds like they’re anti-social.
You don’t have to be friends with your roommates. He should just make friends outside of his roommates and go from there. He’ll likely only be with them for a few more months.
For what it’s worth, I am a gamer and I know lots of other gamers… none of us are like this. They are probably engrossed in their games because they are anti-social and not the other way around.