Arnold
No, then i guess bane's lightning ritual would also be the greatest of the sith teachings because of its "magnitude".
...
You don't consider the creation of a storm that alters a planet's climate for years "great"? What about the thought bomb? And the force-storm?
Face it. The most destructive techniques of the Sith are almost always their most feared and sought-after, not to mention complex in nature and incredibly difficult to perform. The fact that Nihilus's planetary-scale assault can ruin the surface of an entire world makes in large in magnitude and absolutely terrifying. The fact that it can feed him power makes it complicated. And the fact that it can be performed by one "man" and one "man" only makes it completely unique. Traya's right.
But whatever he does is clearly more than just a large-scale Force-drain. It's a black cloud - think black pyroclastic flow - that engulfs an entire planet. It razes buildings to the ground, flattens the earth, and rips flesh from bone.
It's clearly a little complicated.