Imp Drain Life, Warlock must have

I made my first group of 5 like 8 months ago to try it out, and I finally had the inclination to play WoW again and the money to continue my 5 boxing, so I'm finding out new old reasons why I made my team the way I did.

So just to share my excitement, I wanted to say how cool it is to have 3 warlocks with Improved Drain life, all benefitting from every single affliction spell on the target.

I just put my first talent point into Imp drain life, and remembered that was one of the reasons I went with locks, knowing how locks work from my 70's, I knew having that many more dots would make their drain ridiculous. Yes it means more threat, but at the same time, I don't know of too many elites that can kill my 1 man 70 lock while he's draining them (quickly at least), let alone 3 warlocks with all those dots making them even better.

So not only do locks have seduce, banish, and pet off tanks, they are off tanks themselves. I love my undead minions.