i wouldnt call a major nerf to the whole design of the class a "much QQ over nothing"

warlocks have allways been designed around stamina.

we dont have spirit or mana regain talents we even have imp life tap if life tap wasnt a core abbility it wouldnt have a improved talent on the tree

theres a reason we have more stamina than int and next to 0 sprit on are sets is because
we have been desgined around useing life tap!

Yes, but you're a warlock. You don't get to complain.

I did the math for my neglected lvl 70 lock.
This is how it breaks down:
Current lifetap cost: 1185 health
Current lifetap gain: 1335 mana
New lifetap cost: 1378 health
New life tap gain: 1128 mana
That is a 14% decrease in mana gain for a 15% increase in damage received. Basically that runs down to a 29% decrease in overall casting sustainment. As one of the primary damage dealers in a group that puts a huge amount of slack for the rest of the party to handle. The tank will be fighting longer. The healer healing more. This is no joke of a nerf. Warlocks will be drinking more than hunters in instances now.