I think Fiora can be an extremely hard carry but is not viable in ranked at the moment. Kind of like master yi V0.7. But she is very fun to play and can be very rewarding.

You want to play this champion if you love getting accolades and like to kill.

You do not like this champion if you don't like no cc, "weak if not fed" champions.

Pros

Great base stats
cannnot be left alone (does tons of damage)
fast
fun

Cons

Short gap closers
Random champions hit with ultimate
slow if you can't reach enemy champion
can die from ult bait
squishy late game
weak if not fed to a certain degree

Pretty much straight forward. Can go ad marks and quints.

I prefer maxing W over E because in lane, you never really use E because of her high cooldowns and lack of CC. With W you can easily trade with other auto attacking champions and get ahead.

First build is for actual try hard Fiora.
Why trinity force? You get cc, damage, crits, hp, movement speed, everything.

Second build is for happy fun time Fiora.

:D Tiamat and her ult is op.

I prefer exhaust over ignite because of the lack of cc she has.

You can take ghost or ignite. Teleport also works good, so does heal.

I prefer flash+exhaust

Do not jungle with fiora. She has extremely short gap closers and someone like tryndamere or udyr is a much better pick if you want to jungle.

Remember that the first person you target with your ult will be the person you land on.

Thats all. Straight forward. Kill squishies. Don't die.
Don't get caught