Been playing fine since midnight release now suddenly today it says halo 4 servers unavailable and only a few hundred others available playlists. Was in the hundreds of thousands before. Oddball and others seem to be missing as well… Anyone else having this issue with a solution?? Tried restarting Xbox, modem and router and reset them too… Left everything off for half the day and still getting same error… Any fixes?? Is 343 aware of this issue??? went to bed woke up and tried again same error message
Yeah for me as well. I played matchmaking till one am. Then played the campaign for an hour but when I went back and tried to play online it told me servers unavailable. I assumed it was because they were changing the playlists for this week. But i still can’t play online. 
Try restarting your 360, it usually fixes this for me.
Same problem, tried restarting the console, router, nothing worked. Real annoying