My DH plays EverQuest, which isn't terribly violent (no guns) but is totally addictive.
It's role-playing fantasy stuff, wizards and magicians and elves, etc.
I've played it (
) and while it is entertaining, it's horribly time-consuming.
BB (before baby) he could easy waste an entire weekend playing EQ. He'd get up early and start playing, run to the kitchen to grab some food, take a potty break every so often. Sometimes he wouldn't even shower until Sunday night!
His EQ time has been curbed greatly so I don't really mind anymore, but once DD is older I don't want him doing it so much. I don't want her to be a game freak. :LOL