As in quitting in PvP or raids or strikes unless like they turn off the console or internet disconnects. But purposely quitting shouldn't even be an option IMO. Otherwise people just quit every game simply because they're losing or stat whoring
Edit: maybe certain leway for situational purposes so I guess like after 3-5 quits you get like a 15-30 min ban or something
Edit: an impulsive thread on my part. 15-20 games of 3/4 people quitting in halo 4 today really annoyed me so yeah I'm a little impatient but still it gets annoying when people are quitting simply because they're losing I understand people have situations where they have to quit. That's fine. But still. If it's often enough. You should get punished for it.
I guess I am the only person that doesn't care all that much about people quitting a match. I've played CODG matches and myself and my brother were the only ones left. We stuck it out and we lost, but it was fun. I will quit a match if I am being spawn camped and can't even get out of spawn without dieing. That is not fun.