Comments on Fiora (warning, it's whiny, I know, don't just downvote without commenting)
The hitbox on Fiora's Q doesn't match up with her attack range. This may be simply due to the animation of the spell, but it does feel incredibly unfair.
Fiora has an unnecessary attack speed slow. Honestly, it should be removed or moved to an ability other than her W. Her W is for blocking damage or CC, not for slowing the enemy's attack speed slow if you mess it up. It could be moved to her passive for example. This would also make more sense thematically, and it would place more emphasis on her positioning minigame with Vitals.
Also, I think they should nerf the movement speed on Vitals. Vitals are about crippling the enemy, not about buffing Fiora. They could then keep the slow higher than 30% on her E.
These are my personal thoughts, please let me know which parts you agree or disagree with. This isn't a super constructive post, I just want to know if I'm sort of right with my thoughts on Fiora before I make a better post with unbiased ways to make Fiora feel more fair to play against.