No, you’re not the only one having issues when it comes to Halo 4‘s online multiplayer this afternoon. As of 30 minutes ago, there was a swath of users all over the Internet complaining that they couldn’t play their newly obtained copy. 343 Industries is aware of the issue and is working on it right now.
We are aware of the servers issues & currently investigating. We will keep you updated. Thanks for your patience.
— Halo Waypoint (@HaloWaypoint) November 6, 2012
We’ll keep you updated and let you know when the servers are back online. If you haven’t voted already, and live in the United States of course, now would be the time to do so!