Gamasutra: The three major consoles out right now have numerous differences. However, one rather interesting commonality they all share lies in their top-selling games -- the majority of them are competitive multiplayer. There are completely different demographics between them, but it is an interesting fact that people who play games like interacting with others while playing. This is also a common feature among children's games.
There seem to be two types of competitive multiplayer themes prevalent in children's video game design that I have noticed in my tenure working in games: accommodating vs. empowering. These themes come from two schools of thought in game design. One is to create an "interactive experience", while the other is to stick to a more traditional definition of a competitive game experience.