It wasn't working from about 8:30 last night, there was a message on the battlelog site (redirected from their twitter account) saying that there was server maintenance that would affect the 360 players.
I think it opened up to all xbox gold members yesterday? If so, that probably contributed as well. For such a big game, less than 48 hours after the beta came online, why do EA need to do server maintenance? Its ridiculous!