What do you think about free content? I mean games. What genres are preferable? How many games 1 player plays at a time? What kind of? Shooters? Arcade? Rally? Or what? Any ideas?
And this is Regard to? Are you talking about as in a Site for Online Games? For that you should create almost every category, so that people can play it upto their liking. However most professionals prefer strategic or Logical Games online.