As someone else said, that's what makes him cool. He knows he doesn't deserve anything, he just wants to try and make up for what he's done. And he did just that. By saving Naruto's life, he's saved the world.
By your logic, Orochimaru and Kabuto are the true saviors. The former resurrected the Edo Hokage, which led to Minato saving Obito from being killed by Kakashi, which allowed Obito to save Naruto twice later on in the manga; the latter saved the co-fighter against Kaguya (who is needed to seal her, btw, so it's not just Nardo who's going to save the world) when he was fodderized by Madara.
Praise Orochimaru and Kabuto!
Regardless, it doesn't matter who the savior(s) are because Obito is the assclown who started all of this. He deserved his godawful death; at least he knew that much.