First and foremost, much like everyone already knows. Lightning is way too over-tuned a ability with having multiple charges and such short cooldowns. It's an AOE ability that is able to interrupt casts/actions from range with such a short cast time with virtually 0 draw back.
Why is this class allowed to have an ability be so oppresive?
If you get caught by a mage, you have 0 chance of recovering if he keeps his distance from you as a melee player. If you try to pop a heal, guess what? INTERRUPTED.
You're just running till you're dead or outta pots. Super fun gameplay devs! Really love being able to do nothing against that!