I'm ok with nerfing MF, but are we sure we want to take away an expression of skill?
##No, removing MF's double up bonus damage is not removing her expression of mastery.
All Riot did was remove the reward for hitting that double up after executing the first target, considering that Lethality already functions like an anti-squishy stat. MF no longer needs that bonus damage to make it "worth". Double up still functions the same way but it no longer has the extra damage to obliterate a squishy after they get hit by just one Q.
Just remember that this is a PBE change.
This may be an extreme case where Riot is looking for the breakpoint for this Q nerf. It isn't sure that it's going to ship with the bonus damage completely removed.
Case in point:
http://imgur.com/22ytw3O.png[img]
On an enemy dummy (100 AR, MR - 50% damage resistance), MF's (lvl 11) lvl 5 double up Q that kills the target and procs the passive on the second target, deals around 415-420 damage. That's with no runes, masteries and just two Lethality items.
Now try that with lvl 11 Caitlyn that has armor seals that equal to 62.6 armor.
Her HP pool is 1226. Proccing MF's Q bonus damage and applying her passive equals to (from the screenshot stats) 240 + (180 x 1.5) + (180 x 0.9) = 672 raw damage.
Now we account for her armor and Lethality reduction (62.6 - 18.76 arp) = 44 armor.
Damage formula is as follows (100 / 100 + [armor]) = 672 x 0.69 = 467 + 49 =** 516 damage.**
That's 42% of Cait's HP in one skill, just shy over 1.5x more damage than her AA + passive.
Keep in mind that Practice Mode has some issues with inaccurate damage numbers.
The actual damage (from lolwiki and math) on the dummy should be - 49 damage.
So i simply added this number to the MF's double up Q to get to 516 damage.