[@dirty slime]
Force Storm's greatest feat is destroying a fleet. Sure it sounds impressive, but what does it actually DO? In terms of usefulness, being able to annihilate planets is way beyond his force storms. And the force storms usually just teleport people anyway, which makes them EVEN LESS USEFUL.

What is your concept of the Force? It's not like the Force is divided over all Force Wielders, and the more of them there are the weaker they are. It's the primal energy of the universe, the life force of all things. Even all the Sith in the Old Republic combined probably weren't wielding more than a fraction of the total sum of the Dark Side. Shit, by your logic, if there are enough powerful Sith it's impossible to become a powerful Sith, because they've already taken most of the cake.

Revan's feats put him on-level with the likes of Yoda as one of the greatest Sith of all time. A warrior capable of using the Neutral side of the Force, overpowering entire strike teams of Jedi Masters with relative ease. Revan was ridiculously skilled, the kind of warrior who'd be able to annihilate Vader with both arms behind his back. And Vitiate casually burnt him to a crisp.

Of course, he also annihilated an entire team of Jedi Masters, consisting of some of the most powerful Jedi in the galaxy, by breaking through all of their lightsabers at once with a single lightning storm. He then broke their wills moments later, turning them into slaves to his will.

Tools and Darksiders? Not at all. He ruled an entire empire, but he fought alone. Usually against the members of said empire as they attempted to betray him. Betrayal doomed Sidious. But Vitiate psionically learned of his betrayal and proceeded to one-shot the Dark Council, the 11 most powerful Sith in the entire Empire. To give you an idea of how powerful these guys are, a battle between two members levelled a palace the size of a city block, which just happened to have been built to withstand heavy assault.

Sidious mind controlled an entire planet to a minor extent. Vitiate controlled an entire world, instantly, at a whim. He broke the minds of hundreds of Jedi, among them the most powerful Jedi in the Galaxy. And unlike Sidious, he does this mid-combat. No mild confusion bullshit, instant complete domination of the mind. Vitiate was so powerful that merely brushing against his mind was enough to cause most Sith to have an epileptic attack, including people like Darth Bane. Sidious might maintain his control for longer, but Vitiate is able to control mid-fight with ease, over an area the size of a planet, in addition to breaking the wills of some of the most powerful Force Wielders in the galaxy.

He was so powerful that his body could hardly contain him. But after he died, he just resurrected himself, and continued to wreck shit.

While in a weakened state, Vitiate was able to casually deflect the lightsaber of one of the galaxy's greatest fighters with his bare hands, not taking the fight seriously at any point during the fight. What's Sidious gonna do when his saber bounces off of Vitiate? Assuming Sidious is able to move before he gets simultaneously mindraped, burned to a crisp and drained into an empty husk.