I'll be honest after playing a bit (3 games) of fiora, shes not that bad.
Her q is pretty cool later on, early on its meh but still gives good mobility.
W is really annoying. Its cast time takes way too long and I can't see myself using it in a duel unless the opponent has predictable CC, like TF. Its just too hard to use sometimes and its timing is really weird.
E is pretty potato until late game, I really would've preferred the old E because it gave a nice speed boost rather than a slow. Plus it actually gave attack speed for a few seconds rather than a whole two attacks.
Ult is... awkward. Sometimes I can't even tell if I casted it or not, and its really only easy to pop all vitals once you have max q. The heal is pretty good. I see myself just popping it on the frontline before they die late game to try and heal my backline.
Passive is frustrating. Half the time I can't pop this pile of shit and even when I do it doesn't do that much damage early on. The only way I can pop it is to just spam Q, which I still don't fully understand how it works.
I think she should be built pretty tanky. Usually Hydra into tank shit like visage/randuins/whatever and getting LW sometime later on when you need it.
Overall this isn't Fiora. This is not what a duelists kit should look like. When the FUCK does a duelist randomly get a janna ult exactly? I still don't like this champ as a Fiora rework, but it could've been nice as something else.