She is good indeed in pro play because the teams there are organized and the ADC's are heavily guarded, soloq doesn't do that much.
And in EUW, EUNE and NA she is at highest 14th, then 16th and 17th. In other words she is either dead last or 3 steps away from dead last across most servers. Is that enough for looking at the whole?
And sivir is....not great either, she is so simply that most know what she does and how to counter it. It would boil down to her support there too.
And Close range Ashe ulti stuns only briefly, even with that ashe loses extremely hard in damage against a lethality user.
She is awful against cait do caits trading patterns being quick and brutal which ashe can't deal with at all. And Varus.....is an Ashe with more upfront damage that then becomes a AD xerath with a root Ulitmate. He is very good against her too if played well.
Nope, current Ashe sucks against pretty much everything and counters nothing, this because she lacks any form of meaningful damage without a powerful support to back her up and in that case it's often better to just give the support all the kills and have them end the game before the enemy can comeback.
And Sivir is actually good with just
due to being able to push extremely hard and spamm Q quite freely. Issue is just that she is so straightforward meaning nearly anyone knows what she does.