I'm a long time player from Balmung and I can say that this server is in utter shambles due to being pretty being turned into a +18 tourist place.
But my main issue with it are:
1) The horrendous queue times, even at dead hours
2) Ul'dah and Limsa Lominsa (and soon Gridania!) being congested due to the amount of people server hopping
3) Latency issues when so many players congregate in the main cities
Please do something about it, I know Square Enix has locked Firmament's access to Wanderers and Travelers, I'm sure you can lock a whole server as well.