Of course, there are ways to make it work, where you can have a ganking jungler influence the winning lane and snowball that way. We didn’t always have these winning lanes that we can snowball from, but it also tied in with the way we drafte...
it's all bad. That, paired with things like Sylas that can counter Amumu, makes Amumu not as good anymore. I also think people have just probably learned how to play against it.