My personal opinion as to why Sivir simply just isn't good
There are three primary things I noticed about Sivir that, at least in my opinion, make her worse in comparison to a large majority of the other ADC's.
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Her AA Range - Of all three reasons, I believe this to be the major one that makes her just absolutely horrible. Her AA range is the lowest in the game, matching up with Kog Maw's at 500 (which he can even increase with his W). This completely ELIMINATES her chances of Kiting except with her W, and even then, the W's don't do a ton of damage. If this were increased I believe she could be completely viable.
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Her Passive - This passive is seriously one of the most atrocious passives I've ever seen due to the fact that it simply doesn't belong on Sivir. As I stated earlier, her AA range is the lowest of all ADC's. So, if you're telling me that the only way for her to get this passive activated is to walk up to an enemy and attack them, when she has the lowest range and therefore would end up in the range of whomever she is attacking to try to get better movement speed to attempt to kill them... I mean, it just doesn't work. If I had any kinda of cc, I could completely destroy her every time she tried to walk up to me to try to kite me. Perhaps I don't quite understand how kiting works, so by all means, please inform me as to how this passive could ever synergize with her kit, but based on what I've seen, this just doesn't work.
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Her Kit as a whole - She has one ability that does damage. One. I checked every other marksman in the entire game, and even Urgot's E does poison damage (I'm not entirely sure about Azir or Twitch yet so if someone could tell me if they have more than one damage ability that would be nice :3), yet Sivir literally has ONE DAMAGING ABILITY.
Look, I understand some people are VERY skilled with this champion and are unaffected by these issues, but for someone who has tried most other marksman at least once before, I honestly think Sivir is the worst out of all of them. Any thoughts or arguments defending her maybe? By all means if you have a counter argument feel free to say it, I want to hear your guys' thoughts; Perhaps I'm looking at this totally wrong.
TL;DR - Sivir is a bad ADC in comparison to every other one due to three major flaws within her kit: Her AA range being the lowest in the game, her passive being rendered useless, and her entire kit being comprised of only one damaging ability.