[2.1] Miss Fortune Guide - Fortune Doesn't Favor FOOLS!

Like to start with Brawlers as having a crit chance is better then not but since your double up second hit is always a crit a long sword most of the time as first item. first b) Haunting Guise if leveling make it rain for AP harassment from a range.

 Once you get Liandry's the Shadows enchant on boots can be real useful as liandy's ticks for double damage if target is slow, the ghost can also find enemys out of position for your ult to mow em down and also make it rain slows for max burn and to stay in combat longer to get 10% damage increase. Finish your IE as soon as you can you cant go wrong buying Infinity Edge, it gives you everything you need. I've tested against dummies' for DPS and 4 IE plus Mortal Reminder gives MF's ult the highest damage with 4 IE and Landry's being a close second. So Mortal Reminder is actually a good damage item for how gold efficient it is even if you dont need the grievous wounds heal redux but it is nice to have with your ult. Black Cleaver is also a good optional item if your team has other high AD champs then your ult will shred the the enemy teams armor in a flash also upping your DPS to finish off any survivors. 

You should always get a second crit item even if its just a Agility Cloak wanting to aim for 45% to 50% crit, skipping ether the Black Cleaver if your team is AP heavy or the Liandry's if you max Double Shot for a 3rd IE will give 75% crit or Statikk Shiv is also amazing item if you dont want to depend on your ultimate SS can proc off Double shot can the effect can Crit as well.

infinity orb is good in theory as it will add crit to make it rain and your ult on low health enemies but the DPS vs other items in testing on target dummies proves IE is better as your ult can already Crit so just get 100% Crit to ACE the enemy team with one Ult

Lastly get hourglass/stasis over shadows if enemy assassins after your booty and especially if you dont get Liandrys or if your team/support has a slow. its just to good and will save you if your Ult goes wrong somehow..