While I've encountered a few bugs since it went live, it didn't seem to ahve any more than I've experienced in other MMORPGs when they went live.
Although, I did run into a funny one last night. I disabled a Navy ship and went to board it. However, my character started levitating off the ship. The more I ran around, the higher he got. Then I could walk over the water between the Navy ship and my ship. After standing over my ship for a moment or two, I usually fell back to the deck. I got some interesting screen shots out of it.