When Madoka transformed that was really amazing wasn't it. I never had any doubt that she'd become the most powerful magical girl in the world. But I never dreamed she'd take down Walpurgisnacht with one shot.
Her fate was bound to happen sooner or later. She was the strongest of all magical girls and she destoryed her greatest enemy. It's only natural she'd turn into the wickedest witch of them all. And in her current state I'm estimate it will take her no longer than ten days to destroy the planet. Oh well, it's humanity's problem now. We've pretty much filled our quota and have more than enough energy.