Video games and your opinions ?!

My step son is 7. He doesn't have friends nor does he know how to even make friends. He is constantly playing video games at his mothers house. Every time we ask him what he did at his mothers, it's always "I played my game". I was wondering what is other parents opinions on video games and time limitations. We do not allow him to play video games at our house because we feel he plays way too much at his mothers. 
Do you allow your child to sit in front of the tv playing games all day? How do my husband and I confront his mother about game times? It's becoming a serious cause for concern, as all he wants to do is that and he does not want to make friends or hang out with other kids.