I've still used her mid and she wrecks consistently. Many champs scare the **** out of me late game (bad Eve's are terrifying once they have a DFG) but she is a better melee mid assassin than akali because of her Q. I have taken on akali, brand, eve, ahri, and a bad LB (not sure how a good one holds up to her). Gragas and Morg gave me the most problems, but using my ult as a dodge mechanic for their skill shots was effective; their tankiness saved them in a lot of cases unfortunately. But I have no issue with her, even when my team loses I at least go even.
EDIT: I also stack MR early, which is really helpful, starting with merc treads, two dorans rings, and then abyssal, it kind of ruins their day