Think about it from a mathematical point. Exactly how much base damage did they nerf from the skill (R). At rank 1, only 10 damage a shot was taken. At max rank, only 40 damage per shot, which is the equivalent to 160 damage if all shots land. If the target has decent armor, the damage reduction is huge. That's why I said a tank won't really feel it. But for someone who effectively doesn't have any armor. Or only has like 5 or 10. 120 damage is barely a reduction at all, and you're getting a massive increase in damage for every 1% of health they are missing. So yes, if you land your shots an adc, who only has like 1300-1700 hp, and you're building armor pen build, you will still make them poetry. The W and first two shots might get them down to around half maybe a little over. 3rd should put them below 40 where your mastery will kick in and give you even more damage, and that 4th shot, with 60% of their health gone, will end them.
That's if you're even. If you're ahead you might only need to land 3. but in any case you'll need to land your 4th shot if you're trying to take them from 100 to 0.
You do realize saying "higher dps" at the expense of "lower attack speed" is counter intuitive, right?
DPS is damage per second, which means the burst of damage that shiv provides has to be measured against the time it takes to reproc the shiv, which might mean a 20 point increase to DPS, while an attack speed increase adds a percentage modifier to multiple components of dps, by increasing the rate of crit procs and increasing the number of attacks in general, which cumulatively will lead to more damage in the long run.
PD is the better long term purchase on the sole principle that multipliers are better than static increases in the long run.
Last game
PLEASE?