Velojet, as explained it's just as bad as most cheating in games anyway where players can self-host servers or even MMO's with "anti-cheat". A slightly easier way to fix it is to simply not tell the player they are the host, and to try and pick host by best ping.
rexrainbow, ah awesome, and yes I know it's not MMO quality, but I'm thinking of smaller games that people play with their friends rather than massive multiplayer.
Ashley, ah okay I know exactly what you mean, but I think it'd be really important for built-in support for even the most basic of things like online chat, for those who aren't worried about extreme cheating or aren't basing their game around the multiplayer aspect.
It could be like exporting Windows 8 apps instead though, where you go into the exported files and change a value or two to make the server work specific to your game.
Edit: Ah, online chat would be perfect actually, that way people *could* use it to send gameplay messages without much difficulty, but they'll accept that it's not a serious server.