Here's a secret, every MMORPG has launch issues and it's on purpose. When an MMORPG is launched the first day is going to see the most people attempting to connect at a single time in the history of that MMORPG. The amount of cost associated with having enough servers at launch to NOT have launch issues isn't worth it. Not even Blizzard does it. It is much more cost effective to have your servers hammered, not have enough, and bring them up over time than have tons of servers running from the start. In few days to a few weeks less people will be logging on concurrently and they will add some more servers to meet expectations. The longer it takes to get stable the longer SquareEnix is thinking about how many long term servers they need.
People should be more worried if they play an MMORPG at launch day and they don't have connection problems. It means the number of players is below what they anticipated, which is never a good thing.