Game is fun enough, but they really need to get their act together technically. Servers were also slammed when I logged in earlier, had queues to get in, etc. They had better put more resources online before the FEs start back up next weekend, or they are going to lose a lot of new F2P players that are turned off by this...
It's happening because they increased the population caps to keep the new players from being shut out by login queues. They're working on stability fixes and further increases. It's a balancing act; there were queues this afternoon, despite the fact the game currently has a higher player cap than it's ever had in its history.
There were also plenty of people in the office working today on those fixes. If this was easy everybody'd be doing it.