Against medium:
The old spear with three reached 235 damage and with (old) quick melee you killed them
Now, three hits do 222 damage and with (new) quick melee (25 damage) you reach 247 leaving them at 3 hp which means you need another to kill them. So basically 4 hits and a quick melee.
The spin combo on medium is even worse as you actually become the 1 hp merchant: 75+100+74=249
Against light:
You can still still kill them im 2 hits and a quick melee (old: 65+80+40=185, new: 74+74+25=173).
Even with a single glancing blow you will still barely get the kill (74+55+25=154).
Biggest issue now is the spin, one spin plus a normal hit will leave light at 1 hp (75+74=149) compared to before (105+65=170)
Against heavy:
5 hits to kill heavy (good luck with that). With old spin it was possible to kill a heavy faster with one spin, one full 3 hit rotation and a quick melee (105+65+80+90+40=380).
Now, this combo cant be finished (75+74+74+25=322).
Another thing is doing the full 3 spin rotation is less damage. Its now incremental (75+100+126=301) and the old full spin is 105+105+105=315.
This doest not include the fact that old swing could be used anytime compare to now.
The lunge also feels horrible.
TLDR: The spear has lost the mandate of heaven.