The top three issues mentioned in the letter are experience curves, client performance, and spammers/botters. Most players will agree that it can feel like a part-time job to level your character at times. Some players have had performance issues specifically related to "Cryssystem.dll." And finally, everyone has been forced to /ignore the odd spammer... or fifty. NCsoft is using this opportunity to yet again tell players they are aware of these issues and fixes are on the way.
We're curious how this may relate to differences between eastern and western gaming cultures. Aion has been released for nearly a year in Asia and yet only the outcry from European and North American players against experience grinds and gold spamming specifically seems to be sparking a change.