Let me break this down as simple as i can. Armors - ACC armors have higher def compared to 2 other races. Elems - Bells have the lowest stock attributes in any given amu and ring. Skills - On a melee perspective, Cora doesn't have Slow or Net as a Class Skill. The cooldown on ACC net has been reduced too. Plus, ACC has Fatal Attck that will distrupt your HP regeneration. Buffs/Debuff - Cora and Bells use Force which in any way can be removed/prevented by the opposing races, however, it doesnt apply to ACC specs as thier debuffs cannot be prevented. There is no equivalent for Suppress and Repress against ACC specs. Speed - Another major factor in-game that makes ACC standout. They have it in their elems and Nimble Joint has a higher duration now too. Unlike Velocity for Bells and Cora, this cannot be debuffed. Remind me again why ACC cries a lot.