do you have any idea why those two things are succesful?!? because they are extrememly ecessible, like the 360 and the PS3. Minecraft doesnt take a complicated rig, almost any computer can run that game. Steam makes it sooo easy to buy games.
Minecraft can actually take a pretty powerful machine to run on top settings on a massive map. And yes, both of them are very accessible - at what point did I say accessibility is a bad thing?