I would find something else to occupy my time. I know it sounds trite, buy it might help distract you. Constantly griping to him about it, just actually makes it works. It makes him want to it more. I don't know why, but it does. My husbands vice is the computer. He says it's just his way of unwinding. Sometimes, I'm want to throw it out the window, I get so mad.
You could play with him. I'm not a big gamer myself, but there are a couple of games I try to play. You could compromise, say I'll give you an hour to play, and play with him, and then do something you want for an hour.
Also, have hime walk outside with you, and tell him how you feel about the XBOX. While you are removed from the situation. Think of the XBOX as if he's spending time out the boys. It's taking time away from your marriage; he needs time unwind, but you need time with him as well. Make your marriage a priority, and tell him you want him to do the same.
Don't quit your marriage, don't even let that be an option. Divorce rate is so high. Marriage takes work, but all relationships do. You have to work on your marriage daily. We made a promise for better or for worse. There is a song that says we must walk through the valley to stand on the mountain. Sometimes, it helps me to think about a time when were crazy in love with each other. Those memories help me get through the tough spots. Good Luck. If you need to chat with someone ____@____.com.