This biggest issue I have with Miss Fortune is that her abilities don't feel good to use.
Her Q? In lane, its cute when you can auto a minion, then kill it with Q to have the bullet bounce at the enemy bot laner for bonus damage. But out side of laning phase? You'll basically NEVER get this interaction again. Minions are being cleared by your team. You can't risk trying to be cute with Q bounces because your Q ends up falling off mid to late game compared to your Auto attacks which come out faster and more frequently. They're just straight up more reliable than your Q. So you end up never feeling good about using it because all of the Q's power is in the bounce shot.
W. Early game it admittedly feels okay. Later on though? I don't think I ever truly notice the damage it does. Its an on hit that just looks and feels like 'meh'. Its very nice that it gives you your strut, but its utterly bland now that it lost the healing reduction to enemy champions.
E. Lol, this skill. Do I really have to go over this one? I think everyone understands how much of a joke it is. Even AP MF has trouble trying to use it.
R. Her ultimate. Her god damn ultimate just feels like you're spraying peanut damage in a cone. Why spray peanut damage when your autos allow you to kill people quicker despite your autos only being able to target one person? The only time it was really used for viable DPS was when it did magic damage, allowing AP MF to build spell pen and benefit from it with her E and R for massive AOE melting.