Originally Posted by Emissary of Justice
You're thinking small, simply looking at the motivation for being bad instead of the the actual end game.
Pain's plan: Drop Juubi-level Tailed Beast Bombs on any country that steps out of line.
Sasuke's plan: Wipe out all of Konoha.
Obito: Force the universe into peace through genjutsu.
With what Obito wants, he's hardly an emotional sap. Did Rin dying drive him back to Madara? Yes, because like Nagato, it made him realize his idealistic view doesn't work in this world. Outside of his bitch fit the day Naruto was born, he only employed methods that harmed non-Jinks when the Kages wouldn't peacefully accept his proposal. That's hardly the "everyone needs to suffer because I'm unhappy" approach from the other two.
Did you even read properly what TSO (and Neokakkarot before him) wrote? They're talking about the basal motivation, not the goal based upon such motivation, so only talking about the goal is completely missing the point. And, unless Kishi has a sudden case of decency, Obito wants to enslave the world due to teenager angst. So yeah, there's nothing as of now that puts Obito as a character above Sasuke or Nagato.