Her minion clear is the least of her problems. Its her using a no cost ult to kill a wave, then use that same ult to run into you at 800 MS with EoN so she can't be stopped to kill someone that is the issue.
She is just as cancerous as Tahm. At least every OP pick in the game can be countered in some shape or form, be it better positioning, landing a nicely timed CC, bursted, grouping up to counter them. Quinn none really works. Positioning doesn't stop her from sniping someone since she goes so fast she will just sneak behind you and kill your backline. CC doesn't stop her since she will have EoN so she can't be stopped from jumping on you. She can't be bursted since due to can't be CCed, she will 100% kill at least 1 person which is her job, even if she dies in the process, if she takes out your strongest member, its worth it for her.
I hope she gets gutted since she is worse than normal assasssins. At least they have the decency of you actually knowing where they are or generally where they are coming from to get to you. Quinn can be on top lane while you are grouped up mid and suddenly is flanking you from bot side in the span of literally seconds. If I get blown up by a Talon, Zed, or Kat I feel outplayed since they can damn well die in the process of trying to get the kill. Quinn though? It doesn't take skill or any knowledge at all to just go bird mode, use Yoomuu and EoN and just ram into someone at 800+ MS and kill them in literally 1 hit, and jokes on you she has to be hit twice to stop her, once for EoN and another for her ult before she isn't as scary.