While talking to Xbox 360 Achievements (xbox360achievements.org/news...
... Reach.html), Bungie community director Brian Jarrard said that quitters will be punished in Halo: Reach.
I think one of the new things people will be excited about too, is how we're going to be able to penalize people who are habitually quitting out of games, which isn't exactly cheating, but it creates a really negative experience for everybody else in the game.
We actually have new tools now to detect that and eventually, people who do this habitually will actually be penalized, he continued. We want to be able to remove them from the population so they can't make everyone else keep having a bad time.
He mentioned in the article that it wouldn't just be people who quit a couple times. There's always times when you have to get going somewhere, or something else comes up. How many times till your punished? Hopefully Bungie will release that information before September 14th, when Halo: Reach drops!