or just pull sooner?

Are you killing this fast on Nimgaul Hell? I was having issues with that until I started fighting tougher mobs that take longer to kill.....

Personally, I don't really care for the cooldown while just playing around for fun. However.. I feel that if there were to be a truly competitive ladder of sorts, the cooldown is rather necessary. Otherwise it stifles diversity. The cooldown levels the playing field a bit so that high speed/high life gain attackers don't get as much of an edge over slower builds. Skilled players will still pull ahead, as they should, but at least the average player has more of a fair shot. Without the cooldown, most people will just play the same class to get done the fastest and that's just boring. I think, for competition, all the classes would have to be balanced a bit better before the cooldown gets removed otherwise there's really only the illusion of choice if you want to stay competitive.

The cooldown, while it's awful for chaining in a lot of cases, promotes strategy and timing and helps HC characters by not allowing them to accidentally pull too much too fast. It also slows down the game and keeps people playing longer. I don't think melting through the content at breakneck speeds does anyone a favor really. I suppose there's other ways to do all these things too, I'm just trying to say that there are pros and cons to the pull cooldown. As players, it's nothing but pros if the cooldown were removed, but removing it also affects balance and that's something people need to think about too.

Yes, this is a problem Nimgaul Hell (and far worse for any lower level zones).