Korean Miss Fortune currently has no exact win rate, however the win rate with Miss Fortune in general is 51.44%. This build can definitely good for low Elo players, level 30's, and pre level 30's

Great to play ranked with. Korean Miss fortune currently has an immense win rate in any gamemode and whos to say you cant play and dominate your bot in ranked

In your Laning phase it is best to farm up early as much as u can while avoiding poke or attacks from the enemy adc and support. Miss Fortunes Q Double Up can allow you to farm better by hitting 2 minions at once or you can use it farm up while hitting the enemy ADC behind the minion getting cs and sufficient poke damage. If your pushed up behind tower use your E Make It Rain to clear waves faster and your heavy damage auto attacks to farm under tower. Depending on how well your doing 1 auto attack and 1 Q should be enough damage to make your enemy ADC run from the rift

A good or bad support can really make the ADC do bad or good. Some great supports for Miss Fortune would be Blitzcrank, Nami, Malphite, Soraka, and Leona

Youmuu's Ghostblade has really good armor penetration. When activated before your Ultimate the enemy's health melt to the ground. You can also activate ghostblade with your E for an effective slow and damage and to even just catch up with the enemy

Miss Fortunes Auto attacks feels really nice to last hit with and with your runes and masteries makes it super easy to do it. Use your E Make it Rain to lower huge waves of minions. With the CDR you get with Black Cleaver and the max skill level from E you can use your E ability every 6 seconds and farm a lot easier, faster and more efficient