I recall back in the -Vanilla- day, about every other thread was QQ about 'fear.' This lasted a long time, even when 'stun lock' (100 to dead while inside of a stun) was a real thing.
As some one who played during Vanilla I can vouch that being under the CC fear and see my HP bar fall, has to be the most frustrating gaming emotion I ever felt .. Still can't explain why ..
Basically, you could have your entire team beat on a feared target and the CC would not break. You know, just like a full stun lock .. BUT people accepted being killed inside of a stun and RAGED when the same thing happens inside of a fear.
This is going to come back for sure, now I don't know what % will play Warlock, but back it was not so dominate. Lastly, worth mentioning the SL/SL spec (not sure what patch it became a thing though) ..
Prepare for a new wave of rage ..
PS: Back then the entire team killed the warlock puppy first .. Litreally before doing anything else, ALL DPS would zerg the minion/pet or the lock would not die ..