@qqchurch and sliveryshine
Well yea alot of skills can be held down to extend its effects, while some cant and some skills do full aoe damage to all targets while some are distributed among targets. The problem here is that its not explained as clearly on the skill descriptions. Thats what im hoping they'll fix but i doubt they would.
Moving on, while chatting with some other players, I came up with the idea that the huge variation between the usefulness of skill (some are downright OP while others are absolute rubbish) is to troll players
. I mean it. well imagine if you identified a high grade uber gold weapon with awesome passives. You look at skill 1, great. Skill 2, all good. But when you look at the last skill..... uh-oh.... high mana cost, long cast time, low damage with no other purpose(debuffs or buffs) and peanut size radius of an aoe. Not cool.
You'll end up having to waste resources to replace that skill with something useful, either through random skill change when smelting or probably some CS item they come up with. IMO its a way to get you to spend or farm for gold and or a perfect weapon.