User blog comment:Golden Aegis/Miss Fortune Guide: The Mid Fortune/@comment-4636093-20130106064236

To be honest, AP Miss Fortune does have the 'ult-bot' feel to her.

Make it rain may have a 0.8 AP ratio. But... umm.. that's the total damage over the full duration. You'll usually only get half that.

And you need attack speed to make use of Impure shots. The AS it gives isn't enough to do any serious damage.