The game has been out in Korea and China for a bit and they are now bringing it to the rest of the world. ( space saving cut. Read if you want ;-) )
Overall Aion is a very nice polished game with few flaws. Most of the issues I have hit were caused by Players and this is true of any on-line game. Having an ignore on chat is a good thing.
Played Aion again this weekend. Closed Beta as they are still trying to "region-alize" the game for the US, Europe and possibly other areas.