This is a big problem if you ask me. In all actuality, for 99.44% of game circumstances.
Q - Buff is so situational, that you MIGHT get 1 or 2 of them off during the laning phase, but its definitely not a mechanic that can be counted upon to be available when you need it. Oh almost forgot, they narrowed the bounce cone of Q from 100 deg, to a 60 deg cone, so it's actually harder to get a Q bounce onto the right target now.
W - Applying Strut is basically a no change as well. MF's W is an AS steroid, if your NOT using it to do more damage, you are using it wrong. If you save it to apply strut while running away, you've just done LESS damage during an engage/encounter. Congrats on being a bad ADC.
E - Still underwhelming, still extremely easily avoidable, still roots MF during the cast animation, still has a delay before it shows up, still only applies its slow incrementally in .25 sec intervals.
R - Functionally unchanged for almost all purposes. Its applied stacks of impure shots for a while now so nothing really new with her update.
So basically, after the update, we have Miss Fortune, who plays EXACTLY like old Miss Fortune... except she doesn't have Grievous Wounds, and Q Bounce is harder to hit.