This makes absolutely -no- sense. If the world is full, we should be put in a login queue, not booted back to the main menu with a "Try again" message.
Why is it that I get into a login queue only -some- of the time? It should be every time.
WoW has it. (7 million players)
League of Legends has it. (10 million players)
FFXIV should have it. This would help ease some of the issues people have logging in.