Susano ain't a man, he/it's a giant badass spirit representing a god. Besides, look at it this way:
1. Konoha was almost pwned once solely by some stupid-ass three-headed snake (who was eventually stopped by Jiraiya, but the closest thing Konoha has to Jiraiya now is Tsunade, who we know is weaker than Jiraiya was.).
2. Susano defeated "Orochi" (who was no doubt more powerful than the aforementioned three-headed snake) without breaking a sweat.