Problem w/ husband playing video games?

I've been married for 2 and a half years. He got a PS3 about 6 months ago and plays Call of Duty alot lately and it's causing some problems. I don't mind him having something that he likes doing, but he wants to play EVERY hour he's not working. A few nights of the week, he stays up playing, while I go to bed. We just started trying to get pregnant a few months ago and I'm starting to reconsider if I need to have a child with him. What if this only gets worse? I have definitely expressed my feelings about his game playing many times, but he just says, "only 1 game" which turns out to be about 2 hours. He plays ATLEAST 30 minutes a day during the week, typically more than that and sometimes up to 8 hours a day on the weekends. Plus, it's on our living room television, so I get stuck going in the bedroom to watch tv.I do enjoy Mario Cart, which we play together fairly often, but I have no interest in this game. Plus, he talks to these other guys that play, which seems odd to me. Should I be upset or am I being overbearing?