This build for fiora does extremely high about of burst. when you hit a critical it does over 1000 critical damage. you must rush infinity edge as fast as possible for that is going to be where your burst comes from. as soon as you get your infinity edge the critical damage should go up to somewhere in 500's that is like a 3 hit kill if u have critical 3 in a row.
after that get a phantom to increase attack speed and critical percent.If enemy gets a thornmail or is trying to get one , rush the two bloodthirster as fast as possible. if you you're getting killed easily and enemies run away easily get a frozen mallet.

http://www.youtube.com/watch?feature=player_embedded&v=YRyGvsGbHnM

Pros
+ Great Burst Damage
+ Great Tower destroyer and farmer
+ Can do a lot of damage early game
+ Ultimate is awesome *tip:use ultimate if you going to die,your lifesteal will heal you and it might save u from turret dives)
+ Skills take little mana usage unless spammed
+ Can be a relatively easy champion to pick up and play if played correctly

Cons

- Squishy
- No reliant escape mechanism
- If you start to do really well will get focused
- Requires player to play smart to maximize abilities
- Using Blade Waltz can make you be somewhere you don't want to if used uncorrectly
- Must win lane to be extremely good in late game