My husband and I are a happy gamer couple, pretty much all my exs were gamers, too.
We play some games together, we each have our own laptop so we play a lot apart, too. I don't care how much he plays, but I have to admit that sometimes it does grate on my nerves. He can, on occasion, play so much he forgets his chores or gets so disconnected from reality that he treats me like crap. That's when it's time to sit down and have a talk.
Gaming is such a great common interest to share, though. I love playing RE5 or Halo or GOW with my husband, but it irrittes me that he's better than me at Katamari. -_-
Still, gamers (myself included) do have a habit of getting a little too caught up in games, and people who care about you will obviously want to help you get out of an unhealthy habit, so don't be too hard on the non-gamer girls out there.