AP Amumu is broken.

Ap Amumu can literally two or three shot people, i thought he was supposed to be a tank. I know changing item sets can revel meta but this is beyond that, its just broken, please fix. Theirs a link to the game I'm talking about as reference if you don't believe me. Good luck out there.

Edit: Regardless of if its fair game or not Amumu is supposed to be a dot tank, not a pure assassin. So for that reason alone I think riot, not necessarily players, would want to see a fix to this. But first they must be aware of it if they aren't already.