I dont know about you, but there is 1 champion im always banning if i have a chance.
And she is 
Because fuck her and her race, ultimate and charm are unbearable.
And she is 
Because fuck her and her race, ultimate and charm are unbearable.
I am against her on account of her mobility coupled with her damage and HP recovery. It's all too much.
She is super mobile, has great cc move, does great damage. What is the downside to this champ? I have no problem with champs who have a little bit of everything or are easy to use. But so many get nerfed to hell for this reason while others are allowed to carry on.
The down side to Ahri is the fact that she is a jack of all trades, practitioner of all but master of none. Sustain is just enough to keep her in lane, dashes tied to ult and a move speed boost from Q to help kite or chase, single target CC, damage that is good but not top of the charts good.