I don't know why I'm trying to argue against a Bronze IV Vlad and Ahri main, but I'll force myself and answer you anyway.
If you think her quick movement speed is nothing, then you're literally stupid as fuck. "That's her thing, kiting and mobility hurr", yeah, she already did that, as she had three fucking dashes on her R and her charm to slow her target, plus, she's even more fucking efficient against tanks, since her Q deals a good chunk of true damage on a relatively low cooldown.
That aside, now, they gave her a HUGE massive movement speed burst on her Q. Sure it helps her kiting, but that's not the only issue with it.
By doing so, they gave her even more sticking potential to her target, as she can catch up to you even more easily since her Q is on a really low cooldown and she tends to build CDR. Plus, she doesn't even need her ultimate anymore to escape. Just a few Qs and Es and bye bye, I'm out. They basically removed her only late game weakness, which was very vulnerable when ultimate is on cooldown. That even removed her weakness during the leaning phase which was "no mobility pre-6, so vulnerable to ganks". Now, she can just Q and taunt the enemy jungler from her turret until he's gone.
Her buffs were heavily broken and unnecessary as fuck. Why do you think she had a fucking 56-58% winrate while having such high pick rate when those buffs went live?
To compensate, they just increased her mana costs and REVERTED the W damage buffs she got from the loss of amplification damage from her E. But that still doesn't solve the problem, as she can just build Morello and get blue buff and she negates those mana problems.
TL;DR Ahri is still a fucking oppressive champion right now and she still is fucking ban worthy, since her win constency is very high for a 20% pickrate. That's why she's my priority ban with Janna and Jinx.