[quote name='Xavin']There are actually some games that you can make private, like COD, Vegas 2, and Shadowrun too. So, if that's the only argue for the PS3 (KZ2) then I disagree.[/quote]
If it's a private XBox game then it has to be invite only, meaning only friends of Cheapy/Wombat and their friends have access. It limits how many people can play. If it's a password protected room, it allows all CAG's a chance to get into the game.
Also all the games you list have no more than 18 slots available. I posted the only 360 games with the capability of hosting more.