Camille's ultimate creates unfair gameplay
League of Legends is currently in a state where the game is either played well and both teams win or lose on important plays, or one team gets insanely ahead insanely quickly. This is the only gameplay I've seen in League of Legends for a very long time.
Camille's ultimate allows her to take advantage of everything already in the game to allow AD assassin/fighters to snowball and simply gives her a button to press to do it easily.
On top of that, her ultimate is basically Xin's ultimate but "fixed", so it really doesn't fit League anyway.