Leviathan was having issues early this morning. According to the official notice, It was fixed at 5:43 AM PDT.
Trying to log in this morning (after things have been "fixed"), I see the "server is full message" then get stuck at the loading screen for Coerthas.
I understand that there can sometimes be technical difficulties. However, if things are screwed up, what's wrong with updating the notification? "We are aware of issues and are troubleshooting". SE seems to only provide a notification once they have completed an activity and never to acknowledge when there is something currently going on.