See, there's an option called "Enable auto-target when no target is specified." and you'd think that it automatically targets close enemies when you press a skill key, right? WRONG. It only targets an enemy if an enemy is attacking you. In any group content this is utterly useless for anyone except the Tank.

My suggestion is that this option is revamped into a pair of options: one for auto-targeting enemies that attack you, and another for auto-targeting enemies when you press a skill key while not targeting anything. That way when the DPS is AoE'ing mobs and one dies, they're not just sitting there spamming the "Invalid Target" notification, and the abilities instantly activates after one mob dies, the system automatically targeting another.

Most MMOs I've played before does this, and every RPG I can think of with a targeting system does as well. It's a great addition to this game, and in the case people don't want to use it? Turn the option off.