The mage classes have a myriad of CC options while the healers have incredible longevity that is really difficult for a solo class to take down. The game really is not balanced for 1v1 in the slightest, as it seems right now that 1v1 (dueling) is basically a food chain of mages defeating melee which are defeated by rangers and good clerics who in turn lose to assassins and such. The one surprising part of this all is that when NCsoft held an official 1v1 tournament in Korea after the live release of Aion to get cheap World of Warcraft Gold. One of the least likely classes to win emerged victorious: the templar. Templars are basically the tank class that are built to soak damage and can put out some in return but most people were shocked and really expected a sorcerer or cleric to win. I could not find the videos of the templar winning the 1v1 portion but here is a really entertaining clip of part of their 3v3 tournament with some really close matches.