I discuss video games a lot when I see kids for well child visits. There are definitely positives and negatives about video games, and I think it is important to know what your kids are playing. I have three kids and a husband that I play games with at home. At our house, we have "game night" every Saturday night. I don't have the manual dexterity of my husband or stepson, but I can sing Journey songs on Rock Band 3 with the best of them :)
I read an article recently discussing Internet/video game addiction by Mike Rich, who runs the Center on Media and Child Health in Boston. This is a link to his website, which is pretty informative:
http://cmch.typepad.com/mediatrician
