I played for about five hours today, all at various times of the day and night. Aside from a few moments of rubberbanding, I had 0 problems with the server. No disconnects, no game killing lag. I only had one broken quest where it wouldn't give me credit, but there was a work around that did give me credit on the 2nd try.
I had expected server ques, disconnects, crashing in character creation, etc. None of that happened. It was a smooth fun ride.