AP Ali is somewhat abusive and definitely annoying, but if you played with it sometimes for lulz like I do, you would notice that he can be easily dealt with, if not by all champions that by most of them.
Basically only thing he does is WQ combo, and many other champions can mess with it, although it takes quick reactions, but if you do he's done. At very worst champion he targets can flash away his headbutt, avoiding all damage and leaving Ali in vulnerable position.
Probably the worst case is if he plays support and rushes spooky ghosts, as his WQ->TLD+frostfang passive is really devastating, especially if someone on your botlane plays with 30 MR, but if you don't feed his lane he will than lack gold for anything, as spending cash on AP means low tankiness until late game, and many supports can counter him, as if you break his combo he is a free kill.