"Trying to define what should be meaningful for other people is pretty arrogant and an insular perspective on life." - I think this statement is lazy in that it's taking the cultural relativist approach. By this token, we shouldn't make judgment on female circumcision in Africa, or the one child rule in China. In their societies these practices have very important value but I think most of us probably feel like it's morally wrong.
I think we can argue there there is a world where there should exist universal qualities. I certainly wont knock the author for trying to argue video games inherently don't have the same value as say "going for a walk" and helping your family or community...